Measurement of J/ψ production in association with a W± boson with pp data at 8 TeV

JHEP01(2020)095 Published for SISSA by Springer Received:October 1, 2019 Accepted:December 27, 2019 Published:January 16, 2020 Measurement of J/ψ production in association with a W±boson with pp data at 8 TeV The ATLAS collaboration E-mail: [email protected] Abstract: A measurement of the production of a prompt J/ψ meson in association with aW±boson with W±→µν and J/ψ →µ+µ−is presented for J/ψ transverse momenta in the range 8.5–150 GeV and rapidity |yJ/ψ|<2.1 using ATLAS data recorded in 2012 at the LHC. The data were taken at a proton-proton centre-of-mass energy of √s= 8 TeV and correspond to an integrated luminosity of 20.3 fb−1. The ratio of the prompt J/ψ plus W± cross-section to the inclusive W±cross-section is presented as a differential measurement as a function of J/ψ transverse momenta and compared with theoretical predictions using different double-parton-scattering cross-sections. Keywords: Hadron-Hadron scattering (experiments) ArXiv ePrint: 1909.13626 Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3. https://doi.org/10.1007/JHEP01(2020)095 JHEP01(2020)095 Contents 1 Introduction 1 2 ATLAS detector 2 3 Event selection and reconstruction 3 3.1 W±selection 3 3.2 W±+J/ψ event selection 5 4 Signal and background extraction 5 4.1 Inclusive W±sample 5 4.2 Separation of prompt and non-prompt J/ψ 6 4.3 W±+J/ψ backgrounds 6 4.4 Detector effects and acceptance corrections 8 4.5 Double parton scattering 9 5 Systematic uncertainties 9 6 Results 11 6.1 Fiducial, inclusive and DPS-subtracted cross-section ratio measurements 12 6.2 Differential production cross-section measurements 14 7 Conclusion 16 The ATLAS collaboration 21 1 Introduction The associated production of prompt J/ψ mesons with W±bosons provides a powerful probe of the charmonium production mechanism in hadronic collisions, allowing tests of quantum chromodynamics (QCD) at the boundary between the perturbative and nonperturbative regimes. The ATLAS Collaboration has previously presented two analyses of J/ψ mesons produced in conjunction with vector bosons: the associated production of prompt J/ψ +W±in √s= 7 TeV data [1] and the production of prompt and non-prompt J/ψ+Zin √s= 8 TeV data [2]. This paper presents a new measurement of the ratio of the cross-section for associated production of prompt J/ψ +W±to the inclusive W±production cross-section with W±→µν and J/ψ →µ+µ+at a centre-of-mass energy of 8 TeV, exploiting a four-fold increase in integrated luminosity over the previous measurement [1]. The analysis strategy closely follows the methods of the earlier papers. Prompt production refers to a J/ψ meson that is produced directly in the proton-proton collision or indirectly – 1 – JHEP01(2020)095 from a heavier charmonium state, while non-prompt production occurs when the J/ψ meson is produced in the decay of a b-hadron. The J/ψ events that are produced from radiative decays of heavier charmonium states (such as χc→γJ/ψ) are not distinguished from directly produced J/ψ mesons, as long as they are produced in the initial hard interaction. Despite being studied for many decades [3–9], the production mechanism of J/ψ mesons in hadronic collisions is not fully understood. The main models for perturbative calculations of heavy quarkonium production (Q¯ Q) in hadronic collisions differ in whether the system is produced in a colour singlet (CS) state or a colour octet (CO) state [10–14]. The CS model requires two hard gluons in a colour singlet in the initial state, or one gluon splitting into Q¯ Qwhere one of the quarks radiates a hard gluon. The non-relativistic QCD (NRQCD) framework allows the Q¯ Qsystem to remain in a colour-octet state and then generates the final colour-neutral meson via low-energy non-perturbative matrix elements; these matrix elements are determined from fits to experimental data [11,12,14–16]. Associated prompt J/ψ +W±production has been presented as a clear signature of CO processes [17], although other authors argue that higher-order CS processes will dominate [18]. The process W±→W±+γ∗→J/ψ +W±may contribute, but the focus for this measurement is a comparison to the CO processes [19]. The production rate measured by ATLAS at 7 TeV, while having large statistical uncertainties, was an order of magnitude larger than the NRQCD prediction of ref. [17]. This paper reports a measurement of the ratio of fiducial and inclusive cross-sections for associated prompt J/ψ +W±production to the cross-section of inclusive W±production in the same W±kinematic region. The fiducial measurement for J/ψ +W±is defined in a restricted kinematic range for the muons from J/ψ decay, and is specific to the ATLAS detector, while the inclusive result is determined by correcting for the detector’s kinematic acceptance to muons. These cross-section ratios are presented for J/ψ transverse momenta in the range 8.5< pT<150 GeV and rapidities satisfying |yJ/ψ|<2.1. The inclusive ratio is also quoted differentially as a function of the J/ψ transverse momentum. Single parton scattering (SPS) occurs in a given pp collision when the J/ψ meson and W±boson are produced from one parton pair, while double parton scattering (DPS) occurs when the J/ψ meson and W±boson are produced from two different parton pairs. The cross-section ratio for SPS is obtained after subtracting the estimated DPS fraction, and is compared with a theoretical prediction of the next-to-leading-order CO contribution [13]. 2 ATLAS detector The ATLAS detector [20] at the LHC is a multipurpose particle detector with a forwardbackward symmetric cylindrical geometry and a near 4πcoverage in solid angle.1It consists of an inner tracking detector surrounded by a thin superconducting solenoid providing a 1ATLAS uses a right-handed coordinate system with its origin at the nominal interaction point (IP) in the centre of the detector and the z-axis along the beam pipe. The x-axis points from the IP to the centre of the LHC ring, and the y-axis points upwards. Cylindrical coordinates (r, φ) are used in the transverse plane, φbeing the azimuthal angle around the z-axis. The pseudorapidity is defined in terms of the polar angle θas η=−ln tan(θ/2). Angular distance is measured in units of ∆R≡p(∆η)2+ (∆φ)2. – 2 – JHEP01(2020)095 2 T axial magnetic field, electromagnetic (EM) and hadron calorimeters, and a muon spectrometer. The inner tracking detector covers the pseudorapidity range |η|<2.5. It consists of silicon pixel, silicon microstrip, and transition radiation tracking detectors. Lead/liquidargon sampling calorimeters provide EM energy measurements with high granularity. A steel/scintillator-tile hadron calorimeter covers the central pseudorapidity range |η|<1.7. The endcap and forward regions are instrumented with liquid-argon calorimeters for both EM and hadronic energy measurements up to |η|= 4.9. The muon spectrometer surrounds the calorimeters and is based on three large air-core toroidal superconducting magnets with eight coils each. The field integral of the toroids ranges between 2.0 and 6.0 T m across most of the detector acceptance. The muon spectrometer includes a system of precision tracking chambers and fast detectors for triggering. A three-level trigger system was used to select events. The first-level trigger is implemented in hardware and used a subset of the detector information to reduce the accepted rate to at most 75 kHz. This was followed by two software-based trigger levels that together reduced the accepted event rate to 400 Hz on average depending on the data-taking conditions during 2012 [21]. 3 Event selection and reconstruction The analysis uses 20.3 fb−1of pp collision data at √s= 8 TeV collected during 2012. Events were selected using a non-prescaled single-muon trigger that required at least one muon with |η|<2.4, transverse momentum pT>24 GeV, stable beams, and fully operational subdetectors. The muon reconstruction begins by finding a track candidate independently in the inner tracking detector and the muon spectrometer. The momentum of the muon candidate is calculated by statistically combining the information from the two subsystems and correcting for parameterised energy loss in the calorimeter; these muon candidates are referred to as combined muons. In some cases a track in the inner detector is identified as a muon if the extrapolated track is associated with at least one local track segment in the muon spectrometer. In such cases the information from the inner tracking detector alone is used to determine the momentum. For analyses studying low-mass objects, such as J/ψ mesons, the inclusion of these segment-tagged muons provides additional efficiency for reconstructing low-pT muons [22]. 3.1 W±selection An inclusive W±sample is defined by applying the W±boson selections listed in table 1. Candidate muons from W±decays are required to be combined and to match the muon reconstructed by the trigger algorithm. The primary vertex is chosen as the reconstructed vertex with the highest Σp2 Tof associated tracks and must have a minimum of three associated tracks with pT>400 MeV. Calorimetric and track isolation variables are defined by calculating the sum of transverse energy (ET) deposits in the calorimeter cells and track pT, respectively, within a cone – 3 – JHEP01(2020)095 W±boson selection At least one isolated muon that originates <1 mm from primary vertex along z-axis pT(trigger muon) >25 GeV |ηµ|<2.4 Missing transverse momentum >20 GeV mT(W±)>40 GeV |d0|/σd0<3 Table 1. Selection criteria for the inclusive W±sample, where µis the muon from the W±boson decay. J/ψ selection 2.4< m(µ+µ−)<3.8 GeV 8.5< pJ/ψ T<150 GeV, |yJ/ψ|<2.1 pµ1 T>4 GeV, |ηµ1|<2.5 (either pµ2 T>2.5 GeV, 1.3 ≤ |ηµ2|<2.5) or pµ2 T>3.5 GeV, |ηµ2|<1.3 Table 2. Definition of the fiducial region for the J/ψ cross section measurement, where µ1is the highest-pTmuon from the J/ψ decay, and µ2is the second-highest-pTmuon from the J/ψ decay. size ∆R= 0.3 around the muon direction. The energy deposited by the muon is subtracted from the calorimetric isolation variable, and only tracks compatible with originating from the primary vertex and with pT>1 GeV (excluding the muon itself) are considered for the track isolation. A correction depending on the number of reconstructed vertices is made to the calorimetric isolation to account for additional energy deposits due to pile-up vertices.2 For the muon to be considered isolated, the two isolation variables defined above must both be less than 5% of the muon pT. Transverse impact parameter significance is defined as |d0|/σd0, where d0is the impact parameter, defined as the distance of closest approach of the muon trajectory to the primary vertex in the xy-plane, and σd0is its uncertainty. The W±boson transverse mass is defined as mT(W±)≡q2pT(µ)Emiss T[1 −cos(φµ−φν)] , where the variables φµand φνrepresent the azimuthal angles of the muon from the W± boson decay and the missing transverse momentum Emiss T, respectively. The Emiss Tis calculated as the magnitude of the negative vector sum of the transverse momenta of calibrated electrons, photons, hadronically decaying τ-leptons, jets and muons, as well as additional low-momentum tracks that are associated with the primary vertex but are not associated with any other Emiss Tcomponent [23]. 2Pile-up arises from multiple proton-proton collisions that occur in the same bunch crossing. – 4 – JHEP01(2020)095 3.2 W±+J/ψ event selection If an event has two additional muons then the J/ψ selections listed in table 2are also applied to define the associated J/ψ +W±sample. The J/ψ candidates are required to have a vertex <10 mm from the primary vertex along the z-axis and must be formed from either two combined muons or from one combined muon and one segment-tagged muon, and at least one muon must have pT>4 GeV. A vertex fit is performed to constrain the two muons to originate from a common point. To distinguish prompt J/ψ candidates from those originating from b-hadron decay (non-prompt), the pseudo proper decay time is used: τ(µ+µ−)≡~ L·~p J/ψ T pJ/ψ T·m(µ+µ−) pJ/ψ T , where ~ Lis the 2-D displacement vector of the J/ψ decay vertex from the primary event vertex, and ~p J/ψ Tand m(µ+µ−) are the transverse momentum and invariant mass of the J/ψ candidate, respectively. Prompt J/ψ candidates should have a pseudo proper decay time consistent with zero (within resolution). 4 Signal and background extraction 4.1 Inclusive W±sample A signal sample of W±→µν Monte Carlo (MC) was used to verify the overall modelling of the signal+background in the inclusive W±sample. The backgrounds W±→τν,Z→µµ, Z→ττ, diboson, t¯ tand single top were also modelled with MC simulations. Most of the MC samples were generated using Powheg-Box [24–26] for the hard scatter and showered using either Pythia 6 [27] or Pythia 8 [28]. Samples of Wor Zbosons decaying into electrons, muons or taus were generated with the Powheg-Box next-to-leading-order (NLO) generator, interfaced to Pythia 8 with the AU2 set of tuned parameters [29] for the underlying event and the CT10 leading-order (LO) parton distribution function (PDF) set [30]. Processes involving t¯ tand single top were generated with Powheg-Box using the CT10 PDFs, interfaced to Pythia 6.427 with the P2011C underlying-event tune [31] and the CTEQ6L1 PDF set [32]. Diboson samples were produced with Herwig 6.520.2 [33] with the ATLAS AUET2 underlying-event tune [34] and CTEQ6L1. Alternative samples are used to evaluate the systematic uncertainties: Alpgen 2.13 [35] with Herwig 6.520.2 parton showering with CTEQ6L1 for W+jets and Z+jets, including Jimmy [36] for multiparton interactions, MC@NLO 4.06 [37] with Herwig 6.520 parton showering for t¯ t, and AcerMC [38] with Pythia 6.426 [27] and CTEQ6L1 for single top. All simulated samples were processed through a Geant4-based detector simulation [39,40] with the standard ATLAS reconstruction software used for collision data. For the multijet background, a standard data-driven technique called the ABCD method [1] is used. Four independent regions (A,B,C,D) are defined in a two-dimensional plane using mT(W±) and Emiss Ttogether with the uncorrelated muon isolation variable. Regions Aand Bare required to have Emiss T<20 GeV and mT(W±)<40 GeV, while – 5 – JHEP01(2020)095 regions Cand Dare required to have Emiss T>20 GeV and mT(W±)>40 GeV. In regions Aand C(Band D) an isolated muon (non-isolated muon) is required. The multijet background in signal region Cis determined from NC=NA×ND/NB, where NA,NB,NC, and NDare the background-subtracted event yields in regions A,B,Cand Drespectively. After accounting for all background events (which contribute an estimated 12% of the original yield, with Z→µ+µ−and W±→τ±νmaking up 80% of the background), a total W±yield of (6.446 ±0.035) ×107events is found. The uncertainty includes the statistical uncertainty in the data sample and systematic uncertainties arising from the background sample sizes, background cross-sections, the multijet estimation and the luminosity uncertainty. The absolute luminosity scale is derived from beam-separation scans performed in November 2012. The uncertainty in the integrated luminosity is 1.9% [41]. 4.2 Separation of prompt and non-prompt J/ψ The associated prompt J/ψ +W±yield is measured using a two-dimensional unbinned maximum likelihood fit to the J/ψ mass and pseudo proper decay time in the region 2.4 GeV < m(µ+µ−)<3.8 GeV and −2 ps < τ(µ+µ−)<10 ps. The pseudo proper decay time for the prompt signal is modelled as a double Gaussian distribution while a single-sided exponential function is used for the non-prompt signal. The prompt background component is modelled as a double-sided exponential function and the non-prompt background is the sum of a single-sided and a double-sided exponential function. The lifetime fit takes into account resolution effects by convolving the exponential functions with a Gaussian resolution function. The J/ψ mass distribution is modelled with a Gaussian distribution for both the prompt and non-prompt signal and a third-order polynomial is used for both the prompt and non-prompt combinatorial backgrounds. To improve the stability of the fit, the mean and width of the J/ψ mass distribution are fixed to the values derived from fitting a large inclusive J/ψ sample. After the fit is performed, the sPlot tool [42] is used to extract per-event weights according to the parameters of the fit model. These weights are used to generate prompt signal distributions for other variables such as the W±transverse mass, the J/ψ transverse momentum and the azimuthal opening angle between the W±and the J/ψ. The results of applying the two-dimensional mass and lifetime fit to the J/ψ candidate events are shown in figure 1, giving prompt signal yields of 93 ±14 (stat) for |yJ/ψ|<1 and 102 ±17 (stat) for 1 <|yJ/ψ|<2.1. Two rapidity ranges are used to account for the difference in muon momentum resolution between the barrel and endcap regions of the detector. 4.3 W±+J/ψ backgrounds The same backgrounds considered for the inclusive W±sample are used for the associated prompt J/ψ +W±sample. In addition, background from Bc→J/ψµν is also considered. Using MC, the expected yields are found to be consistent with zero (3.7+1.9 −3.4events). A significant background arises from simultaneous production of a W±and a J/ψ from different pp interactions in the same bunch crossing, where the two production vertices are not distinguished. The probability that, when a W±is produced, a J/ψ is also produced nearby, can be estimated statistically. The average number of pile-up collisions occurring – 6 – JHEP01(2020)095 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 ) [GeV] - µ + µ(m 0 20 40 60 80 100 Events / 0.025 GeV Data Total ψNon Prompt J/ Non Prompt Background ψPrompt J/ Prompt Background -1 =8 TeV, 20.3 fbs ATLAS |<1 ψJ/ |y < 150 GeV ψJ/ T 8.5 < p (a) 2−0 2 4 6 8 10 )[ps] - µ + µ(τ 1 10 2 10 Events / 0.20 ps Data Total ψNon Prompt J/ Non Prompt Background ψPrompt J/ Prompt Background -1 =8 TeV, 20.3 fbs ATLAS |<1 ψJ/ |y < 150 GeV ψJ/ T 8.5 < p (b) 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 ) [GeV] - µ + µ(m 0 10 20 30 40 50 60 Events / 0.025 GeV Data Total ψNon Prompt J/ Non Prompt Background ψPrompt J/ Prompt Background -1 =8 TeV, 20.3 fbs ATLAS |<2.1 ψJ/ 1<|y < 150 GeV ψJ/ T 8.5 < p (c) 2−0 2 4 6 8 10 )[ps] - µ + µ(τ 1 10 2 10 Events / 0.20 ps Data Total ψNon Prompt J/ Non Prompt Background ψPrompt J/ Prompt Background -1 =8 TeV, 20.3 fbs ATLAS |<2.1 ψJ/ 1<|y < 150 GeV ψJ/ T 8.5 < p (d) Figure 1. (a) J/ψ candidate mass and (b) pseudo proper decay time for the rapidity range |yJ/ψ|<1 and pTrange 8.5< pJ/ψ T<150 GeV; (c) J/ψ candidate mass and (d) pseudo proper decay time for the rapidity range 1 <|yJ/ψ|<2.1 and pTrange 8.5< pJ/ψ T<150 GeV. within 10 mm of a given interaction vertex is determined to be 2.3 ±0.2 and is found by sampling the luminosity-weighted distribution of the mean number of inelastic interactions per proton-proton bunch crossing. This number is combined with the pp inelastic crosssection and the prompt J/ψ cross-section [2] to give an estimate of the pile-up contribution as a function of the pTand rapidity of the J/ψ in the associated production sample. The fraction of pile-up events is determined to be (10.5 ±1.2)% of the candidate events. The desired signal topology is prompt J/ψ +W±, where the W±boson decays to µ±ν. Production of prompt J/ψ +W±with a different decay of the W±boson, or of prompt J/ψ +Z, are treated as backgrounds. Background from prompt J/ψ +W±with – 7 – JHEP01(2020)095 W±→τ±νis determined using MC. An inclusive MC sample of W±→τ±νevents is used to determine the probability of an event to pass the W±→µ±νselection, yielding a background of (2.3 ±0.1)% of the candidate events. Background from prompt J/ψ +Z events is calculated using the measured value of σ(pp →J/ψ +Z)/σ(pp →Z) in the 8 TeV ATLAS data [2]. This ratio is scaled by the probability of Z→µ+µ−and Z→τ+τ−to pass the W±→µ±νselection in inclusive MC samples, giving a total background of (9.5 ±0.5)% events. The J/ψ +Zbackground is subtracted as a constant fraction in the pT differential distribution since the measured ratio between σ(pp →J/ψ +Z)/σ(pp →Z) and σ(pp →J/ψ +W±)/σ(pp →W±) is consistent with being flat as a function of pJ/ψ T. 4.4 Detector effects and acceptance corrections The efficiency for reconstructing muons varies depending on the pTof the muon, with efficiencies of 65% for 3 GeV muons increasing to a plateau efficiency of 99% for muons above 10 GeV. The nominal relative momentum resolution for muons is <3.5% up to transverse momenta pT∼200 GeV [43]. To correct the measurements for reconstruction efficiency, a per-event weight is computed using muon efficiency measurements extracted from large inclusive J/ψ →µ+µ−and Z→µ+µ−data samples and applied as a function of the pseudorapidity and pTof each muon from the J/ψ decay [2]. In addition, a per-event weight is applied to correct the J/ψ rate for muons that fall outside the detector acceptance. The acceptance weight is given by the probability that both muons in a J/ψ →µ+µ− candidate pass the kinematic requirements on pµ Tand |ηµ|, for a particular yJ/ψ and pJ/ψ T. These weights are determined using generator-level simulations. Although inclusive J/ψ spin-alignment measurements find a near isotropic distribution [44–46], this may not apply to the spin-alignment of J/ψ mesons produced in association with a Wboson, due to the different relative contributions of the J/ψ production modes. Consequently, a nominal uniform spin-alignment is used and a variety of extreme polarisation states of the J/ψ are considered for the acceptance correction, one with full longitudinal polarisation and three with different transverse polarisations [2]. After correcting for the J/ψ daughter muon efficiency and acceptance, ratios of crosssections for associated prompt J/ψ +W±production to inclusive W±production are measured in a single W±→µ±νfiducial region defined as |ηµ|<2.4, pT(µ±)>25 GeV and pT(ν)>20 GeV, both differentially in pJ/ψ Tand also integrated over pJ/ψ T. These measurements will be discussed in section 6. Using MC, the efficiency for reconstructing inclusive W±→µν is found to depend linearly on the pTof the W±boson (pW T). A linear correlation is also found between the values of pJ/ψ Tand pW Tfor the associated production sample in data. These two effects lead to a correction to the differential cross-section ratio based on the pTof the prompt J/ψ candidate. To apply the correction, the average value of pJ/ψ Tis determined for each pJ/ψ Tbin in the differential distribution. The linear correlation between pJ/ψ Tand pW Tis used to derive the corresponding value for the average pW Twithin the pJ/ψ Tbin. The ratio of the inclusive W±efficiency to the W±reconstruction efficiency in each pJ/ψ Tbin gives the efficiency correction, which varies from 0.93 ±0.02 at low pJ/ψ T to 0.78 ±0.04 in the highest pJ/ψ Tbin. – 8 – JHEP01(2020)095 10 20 30 40 50 2 10 [GeV] ψJ/ T p 11− 10 10− 10 9− 10 8− 10 7− 10 6− 10 5− 10 4− 10 ) -1 (GeV T dp ) ± +W ψ (J/ σ d ) ± (Wσ 1 ×) µµ→ ψB(J/ ± W→ : pp ± +Wψ prompt J/→pp -1 =8 TeV, 20.3 fbs |<2.1 ψJ/ |y ATLAS =15 mb eff σ Data 2012 Spin-alignment uncert. DPS and theory uncert. Estimated DPS contrib. NLO CO SPS Prediction (a) 10 20 30 40 50 2 10 [GeV] ψJ/ T p 11− 10 10− 10 9− 10 8− 10 7− 10 6− 10 5− 10 4− 10 ) -1 (GeV T dp ) ± +W ψ (J/ σ d ) ± (Wσ 1 ×) µµ→ ψB(J/ ± W→ : pp ± +Wψ prompt J/→pp -1 =8 TeV, 20.3 fbs |<2.1 ψJ/ |y ATLAS =6.3 mb eff σ Data 2012 Spin-alignment uncert. DPS and theory uncert. Estimated DPS contrib. NLO CO SPS Prediction (b) Figure 3. The inclusive (SPS+DPS) differential cross-section ratio measurements and theory predictions presented in six pJ/ψ Tregions for |yJ/ψ|<2.1. NLO colour-octet SPS predictions are shown, with LDMEs extracted from the differential cross-section and spin alignment of prompt J/ψ mesons at the Tevatron [13,14]. The DPS contribution is estimated using (a) σeff = 15+5.8 −4.2mb and (b) σeff = 6.3±1.9 mb and the method discussed in the text. The data points are identical in the two plots. pJ/ψ T[GeV] Inclusive prompt ratio [×10−7/GeV] Estimated DPS [×10−7/GeV] value ±(stat)±(syst)±(spin) σeff = 15+5.8 −4.2mb σeff = 6.3±1.9mb (8.5,10) (10,14) (14,18) (18,30) (30,60) (60,150) 12.6±3.3±2.4+5.0 −2.4 3.8±1.0±0.8+1.2 −0.5 1.70±0.50 ±0.21 +0.35 −0.17 0.52±0.17 ±0.12 +0.08 −0.04 0.156±0.054 ±0.021 +0.013 −0.006 0.012±0.006 ±0.005 +0.0005 −0.0002 5.3+1.5 −2.1 1.64+0.46 −0.64 0.33+0.09 −0.13 0.048+0.013 −0.019 0.0021+0.0006 −0.0008 0.000032+0.000009 −0.000012 12.7±3.8 3.9±1.2 0.77±0.23 0.114±0.034 0.0049±0.0015 0.000076±0.000023 Table 9. The measured inclusive (SPS+DPS) cross-section ratio dRincl J/ψ+W±/dpTfor prompt J/ψ for |yJ/ψ|<2.1. The estimated DPS contributions in each interval are listed for two possible values of σeff . – 15 – JHEP01(2020)095 7 Conclusion The ratio of the associated prompt J/ψ plus W±production cross-section to the inclusive W±boson production cross-section in the same fiducial region is measured using 20.3 fb−1 of proton-proton collisions recorded by the ATLAS detector at the LHC, at a centre-ofmass energy of 8 TeV. The cross-section ratios are presented for J/ψ transverse momenta in the range 8.5< pJ/ψ T<150 GeV and rapidities satisfying |yJ/ψ|<2.1. The results are presented initially for muons from J/ψ decay in the fiducial volume of the ATLAS detector and then corrected for the kinematic acceptance of the muons in the fiducial region. This correction factor depends on the spin-alignment state of the J/ψ produced in association with a W±boson, which may differ from the spin alignment observed in inclusive J/ψ production. Measurements of the azimuthal angle between the W±boson and J/ψ meson suggest that singleand double-parton-scattering contributions are both present in data. The measured prompt J/ψ +W±production rates are compared with a theoretical prediction at NLO for colour-octet prompt production processes. Due to the uncertainty in the value of the effective double-parton-scattering cross-section σeff , two different values are used for comparisons of theoretical predictions with data. A smaller value of σeff brings the predicted cross-section ratio closer to the measured value; however, neither value of σeff is able to correctly model the J/ψ pTdependence, possibly because colour-singlet processes are not included in the prediction. Acknowledgments We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS, CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF, and MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZˇ S, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, CRC and Compute Canada, Canada; COST, ERC, ERDF, Horizon 2020, and Marie Sk lodowska-Curie Actions, European Union; Investissements d’ Avenir Labex and Idex, ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek – 16 – JHEP01(2020)095 NSRF, Greece; BSF-NSF and GIF, Israel; CERCA Programme Generalitat de Catalunya, Spain; The Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (U.K.) and BNL (U.S.A.), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in ref. [54]. 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Cioar˘a24, A. Ciocio18, F. Cirotto68a,68b, Z.H. Citron179, M. Citterio67a, A. Clark53, M.R. Clark39, P.J. Clark49, C. Clement44a,44b, Y. Coadou100, M. Cobal65a,65c, A. Coccaro54b, J. Cochran77, H. Cohen160, A.E.C. Coimbra179, L. Colasurdo117, B. Cole39, A.P. Colijn118, J. Collot57, P. Conde Mui˜no139a, – 22 – JHEP01(2020)095 E. Coniavitis51, S.H. Connell33b, I.A. Connelly99, S. Constantinescu27b, F. Conventi68a,aw, A.M. Cooper-Sarkar134, F. Cormier174, K.J.R. Cormier166, L.D. Corpe93, M. Corradi71a,71b, E.E. Corrigan95, F. Corriveau102,ad, A. Cortes-Gonzalez36, M.J. Costa173, F. Costanza5, D. Costanzo148, G. Cowan92, J.W. Cowley32, B.E. Cox99, J. Crane99, K. Cranmer123, S.J. Crawley56, R.A. Creager136, S. Cr´ep´e-Renaudin57, F. Crescioli135, M. Cristinziani24, V. Croft123, G. Crosetti41b,41a, A. Cueto97, T. Cuhadar Donszelmann148, A.R. Cukierman152, S. Czekierda83, P. Czodrowski36, M.J. Da Cunha Sargedas De Sousa59b, C. Da Via99, W. Dabrowski82a, T. Dado28a, S. Dahbi35e, T. Dai104, F. Dallaire108, C. Dallapiccola101, M. Dam40, G. D’amen23b,23a, J. Damp98, J.R. Dandoy136, M.F. Daneri30, N.P. Dang180,j, N.S. Dann99, M. Danninger174, V. Dao36, G. Darbo54b, O. Dartsi5, A. Dattagupta130, T. Daubney45, S. D’Auria67a,67b, W. Davey24, C. David45, T. Davidek142, D.R. Davis48, E. Dawe103, I. Dawson148, K. De8, R. De Asmundis68a, A. De Benedetti127, M. De Beurs118, S. De Castro23b,23a, S. De Cecco71a,71b, N. De Groot117, P. de Jong118, H. De la Torre105, A. De Maria70a,70b, D. De Pedis71a, A. De Salvo71a, U. De Sanctis72a,72b, M. De Santis72a,72b, A. De Santo155, K. De Vasconcelos Corga100, J.B. De Vivie De Regie131, C. Debenedetti145, D.V. Dedovich78, A.M. Deiana42, M. Del Gaudio41b,41a, J. Del Peso97, Y. Delabat Diaz45, D. Delgove131, F. Deliot144, C.M. Delitzsch7, M. Della Pietra68a,68b, D. Della Volpe53, A. Dell’Acqua36, L. Dell’Asta25, M. Delmastro5, C. Delporte131, P.A. Delsart57, D.A. DeMarco166, S. Demers182, M. Demichev78, S.P. Denisov121, D. Denysiuk118, L. D’Eramo135, D. Derendarz83, J.E. Derkaoui35d, F. Derue135, P. Dervan89, K. Desch24, C. Deterre45, K. Dette166, M.R. Devesa30, P.O. Deviveiros36, A. Dewhurst143, S. Dhaliwal26, F.A. Di Bello53, A. Di Ciaccio72a,72b, L. Di Ciaccio5, W.K. Di Clemente136, C. Di Donato68a,68b, A. Di Girolamo36, G. Di Gregorio70a,70b, B. Di Micco73a,73b, R. Di Nardo101, K.F. Di Petrillo58, R. Di Sipio166, D. Di Valentino34, C. Diaconu100, M. Diamond166, F.A. Dias40, T. Dias Do Vale139a, M.A. Diaz146a, J. Dickinson18, E.B. Diehl104, J. Dietrich19, S. D´ıez Cornell45, A. Dimitrievska18, J. Dingfelder24, F. Dittus36, F. Djama100, T. Djobava158b, J.I. Djuvsland17, M.A.B. Do Vale79c, M. Dobre27b, D. Dodsworth26, C. Doglioni95, J. Dolejsi142, Z. Dolezal142, M. Donadelli79d, J. Donini38, A. D’onofrio91, M. D’Onofrio89, J. Dopke143, A. Doria68a, M.T. Dova87, A.T. Doyle56, E. Drechsler151, E. Dreyer151, T. Dreyer52, Y. Du59b, F. Dubinin109, M. Dubovsky28a, A. Dubreuil53, E. Duchovni179, G. Duckeck112, A. Ducourthial135, O.A. Ducu108,x, D. Duda113, A. Dudarev36, A.C. Dudder98, E.M. Duffield18, L. Duflot131, M. D¨uhrssen36, C. D¨ulsen181, M. Dumancic179, A.E. Dumitriu27b,d, A.K. Duncan56, M. Dunford60a, A. Duperrin100, H. Duran Yildiz4a, M. D¨uren55, A. Durglishvili158b, D. Duschinger47, B. Dutta45, D. Duvnjak1, G.I. Dyckes136, M. Dyndal45, S. Dysch99, B.S. Dziedzic83, K.M. Ecker113, R.C. Edgar104, T. Eifert36, G. Eigen17, K. Einsweiler18, T. Ekelof171, M. El Kacimi35c, R. El Kosseifi100, V. Ellajosyula171, M. Ellert171, F. Ellinghaus181, A.A. Elliot91, N. Ellis36, J. Elmsheuser29, M. Elsing36, D. Emeliyanov143, A. Emerman39, Y. Enari162, J.S. Ennis177, M.B. Epland48, J. Erdmann46, A. Ereditato20, S. Errede172, M. Escalier131, C. Escobar173, O. Estrada Pastor173, A.I. Etienvre144, E. Etzion160, H. Evans64, A. Ezhilov137, M. Ezzi35e, F. Fabbri56, L. Fabbri23b,23a, V. Fabiani117, G. Facini93, R.M. Faisca Rodrigues Pereira139a, R.M. Fakhrutdinov121, S. Falciano71a, P.J. Falke5, S. Falke5, J. Faltova142, Y. Fang15a, M. Fanti67a,67b, A. Farbin8, A. Farilla73a, E.M. Farina69a,69b, T. Farooque105, S. Farrell18, S.M. Farrington177, P. Farthouat36, F. Fassi35e, P. Fassnacht36, D. Fassouliotis9, M. Faucci Giannelli49, W.J. Fawcett32, L. Fayard131, O.L. Fedin137,p, W. Fedorko174, M. Feickert42, S. Feigl133, L. Feligioni100, C. Feng59b, E.J. Feng36, M. Feng48, M.J. Fenton56, A.B. Fenyuk121, J. Ferrando45, A. Ferrari171, P. Ferrari118, R. Ferrari69a, D.E. Ferreira de Lima60b, A. Ferrer173, D. Ferrere53, C. Ferretti104, F. Fiedler98, A. Filipˇciˇc90, F. Filthaut117, K.D. Finelli25, M.C.N. Fiolhais139a,139c,a, L. Fiorini173, C. Fischer14, W.C. Fisher105, I. Fleck150, P. Fleischmann104, R.R.M. Fletcher136, T. Flick181, B.M. Flierl112, – 23 – JHEP01(2020)095 L. Flores136, L.R. Flores Castillo62a, F.M. Follega74a,74b, N. Fomin17, G.T. Forcolin74a,74b, A. Formica144, F.A. F¨orster14, A.C. Forti99, A.G. Foster21, D. Fournier131, H. Fox88, S. Fracchia148, P. Francavilla70a,70b, M. Franchini23b,23a, S. Franchino60a, D. Francis36, L. Franconi145, M. Franklin58, M. Frate170, A.N. Fray91, D. Freeborn93, B. Freund108, W.S. Freund79b, E.M. Freundlich46, D.C. Frizzell127, D. Froidevaux36, J.A. Frost134, C. Fukunaga163, E. Fullana Torregrosa173, E. Fumagalli54b,54a, T. Fusayasu114, J. Fuster173, A. Gabrielli23b,23a, A. Gabrielli18, G.P. Gach82a, S. Gadatsch53, P. Gadow113, G. Gagliardi54b,54a, L.G. Gagnon108, C. Galea27b, B. Galhardo139a,139c, E.J. Gallas134, B.J. Gallop143, P. Gallus141, G. Galster40, R. Gamboa Goni91, K.K. Gan125, S. Ganguly179, J. Gao59a, Y. Gao89, Y.S. Gao31,m, C. Garc´ıa173, J.E. Garc´ıa Navarro173, J.A. Garc´ıa Pascual15a, C. Garcia-Argos51, M. Garcia-Sciveres18, R.W. Gardner37, N. Garelli152, S. Gargiulo51, V. Garonne133, K. Gasnikova45, A. Gaudiello54b,54a, G. Gaudio69a, I.L. Gavrilenko109, A. Gavrilyuk122, C. Gay174, G. Gaycken24, E.N. Gazis10, C.N.P. Gee143, J. Geisen52, M. Geisen98, M.P. Geisler60a, C. Gemme54b, M.H. Genest57, C. Geng104, S. Gentile71a,71b, S. George92, D. Gerbaudo14, G. Gessner46, S. Ghasemi150, M. Ghasemi Bostanabad175, B. Giacobbe23b, S. Giagu71a,71b, N. Giangiacomi23b,23a, P. Giannetti70a, A. Giannini68a,68b, S.M. Gibson92, M. Gignac145, D. Gillberg34, G. Gilles181, D.M. Gingrich3,av, M.P. Giordani65a,65c, F.M. Giorgi23b, P.F. Giraud144, P. Giromini58, G. Giugliarelli65a,65c, D. Giugni67a, F. Giuli134, M. Giulini60b, S. Gkaitatzis161, I. Gkialas9,i, E.L. Gkougkousis14, P. Gkountoumis10, L.K. Gladilin111, C. Glasman97, J. Glatzer14, P.C.F. Glaysher45, A. Glazov45, M. Goblirsch-Kolb26, S. Goldfarb103, T. Golling53, D. Golubkov121, A. Gomes139a,139b, R. Goncalves Gama52, R. Gon¸calo139a, G. Gonella51, L. Gonella21, A. Gongadze78, F. Gonnella21, J.L. Gonski58, S. Gonz´alez de la Hoz173, S. Gonzalez-Sevilla53, L. Goossens36, P.A. Gorbounov122, H.A. Gordon29, B. Gorini36, E. Gorini66a,66b, A. Goriˇsek90, A.T. Goshaw48, C. G¨ossling46, M.I. Gostkin78, C.A. Gottardo24, C.R. Goudet131, D. Goujdami35c, A.G. Goussiou147, N. Govender33b,b, C. Goy5, E. Gozani159, I. Grabowska-Bold82a, P.O.J. Gradin171, E.C. Graham89, J. Gramling170, E. Gramstad133, S. Grancagnolo19, V. Gratchev137, P.M. Gravila27f , F.G. Gravili66a,66b, C. Gray56, H.M. Gray18, Z.D. Greenwood94, C. Grefe24, K. Gregersen95, I.M. Gregor45, P. Grenier152, K. Grevtsov45, N.A. Grieser127, J. Griffiths8, A.A. Grillo145, K. Grimm31,l, S. Grinstein14,y, J.-F. Grivaz131, S. Groh98, E. Gross179, J. Grosse-Knetter52, Z.J. Grout93, C. Grud104, A. Grummer116, L. Guan104, W. Guan180, J. Guenther36, A. Guerguichon131, F. Guescini167a, D. Guest170, R. Gugel51, B. Gui125, T. Guillemin5, S. Guindon36, U. Gul56, J. Guo59c, W. Guo104, Y. Guo59a,s, Z. Guo100, R. Gupta45, S. Gurbuz12c, G. Gustavino127, P. Gutierrez127, C. Gutschow93, C. Guyot144, M.P. Guzik82a, C. Gwenlan134, C.B. Gwilliam89, A. Haas123, C. Haber18, H.K. Hadavand8, N. Haddad35e, A. Hadef59a, S. Hageb¨ock36, M. Hagihara168, M. Haleem176, J. Haley128, G. Halladjian105, G.D. Hallewell100, K. Hamacher181, P. Hamal129, K. Hamano175, H. Hamdaoui35e, A. Hamilton33a, G.N. Hamity148, K. Han59a,aj, L. Han59a, S. Han15a, K. Hanagaki80,v, M. Hance145, D.M. Handl112, B. Haney136, R. Hankache135, E. Hansen95, J.B. Hansen40, J.D. Hansen40, M.C. Hansen24, P.H. Hansen40, E.C. Hanson99, K. Hara168, A.S. Hard180, T. Harenberg181, S. Harkusha106, P.F. Harrison177, N.M. Hartmann112, Y. Hasegawa149, A. Hasib49, S. Hassani144, S. Haug20, R. Hauser105, L. Hauswald47, L.B. Havener39, M. Havranek141, C.M. Hawkes21, R.J. Hawkings36, D. Hayden105, C. Hayes154, C.P. Hays134, J.M. Hays91, H.S. Hayward89, S.J. Haywood143, F. He59a, M.P. Heath49, V. Hedberg95, L. Heelan8, S. Heer24, K.K. Heidegger51, J. Heilman34, S. Heim45, T. Heim18, B. Heinemann45,aq, J.J. Heinrich112, L. Heinrich123, C. Heinz55, J. Hejbal140, L. Helary60b, A. Held174, S. Hellesund133, C.M. Helling145, S. Hellman44a,44b, C. Helsens36, R.C.W. Henderson88, Y. Heng180, S. Henkelmann174, A.M. Henriques Correia36, G.H. Herbert19, H. Herde26, – 24 – JHEP01(2020)095 A. Warburton102, C.P. Ward32, D.R. Wardrope93, A. Washbrook49, A.T. Watson21, M.F. Watson21, G. Watts147, S. Watts99, B.M. Waugh93, A.F. Webb11, S. Webb98, C. Weber182, M.S. Weber20, S.A. Weber34, S.M. Weber60a, A.R. Weidberg134, J. Weingarten46, M. Weirich98, C. Weiser51, P.S. Wells36, T. Wenaus29, T. Wengler36, S. Wenig36, N. Wermes24, M.D. Werner77, P. Werner36, M. Wessels60a, T.D. Weston20, K. Whalen130, N.L. Whallon147, A.M. Wharton88, A.S. White104, A. White8, M.J. White1, R. White146c, D. Whiteson170, B.W. Whitmore88, F.J. Wickens143, W. Wiedenmann180, M. Wielers143, C. Wiglesworth40, L.A.M. Wiik-Fuchs51, F. Wilk99, H.G. Wilkens36, L.J. Wilkins92, H.H. Williams136, S. Williams32, C. Willis105, S. Willocq101, J.A. Wilson21, I. Wingerter-Seez5, E. Winkels155, F. Winklmeier130, O.J. Winston155, B.T. Winter51, M. Wittgen152, M. Wobisch94, A. Wolf98, T.M.H. Wolf118, R. Wolff100, J. Wollrath51, M.W. Wolter83, H. Wolters139a,139c, V.W.S. Wong174, N.L. Woods145, S.D. Worm21, B.K. Wosiek83, K.W. Wo´zniak83, K. Wraight56, S.L. Wu180, X. Wu53, Y. Wu59a, T.R. Wyatt99, B.M. Wynne49, S. Xella40, Z. Xi104, L. Xia177, D. Xu15a, H. Xu59a,d, L. Xu29, T. Xu144, W. Xu104, Z. Xu152, B. Yabsley156, S. Yacoob33a, K. Yajima132, D.P. Yallup93, D. Yamaguchi164, Y. Yamaguchi164, A. Yamamoto80, T. Yamanaka162, F. Yamane81, M. Yamatani162, T. Yamazaki162, Y. Yamazaki81, Z. Yan25, H.J. Yang59c,59d, H.T. Yang18, S. Yang76, Y. Yang162, Z. Yang17, W-M. Yao18, Y.C. Yap45, Y. Yasu80, E. Yatsenko59c,59d, J. Ye42, S. Ye29, I. Yeletskikh78, E. Yigitbasi25, E. Yildirim98, K. Yorita178, K. Yoshihara136, C.J.S. Young36, C. Young152, J. Yu77, X. Yue60a, S.P.Y. Yuen24, B. Zabinski83, G. Zacharis10, E. Zaffaroni53, R. Zaidan14, A.M. Zaitsev121,an, T. Zakareishvili158b, N. Zakharchuk34, S. Zambito58, D. Zanzi36, D.R. Zaripovas56, S.V. Zeißner46, C. Zeitnitz181, G. Zemaityte134, J.C. Zeng172, O. Zenin121, T. ˇ Zeniˇs28a, D. Zerwas131, M. Zgubiˇc134, D.F. Zhang15b, F. Zhang180, G. Zhang59a, G. Zhang15b, H. Zhang15c, J. Zhang6, L. Zhang15c, L. Zhang59a, M. Zhang172, R. Zhang59a, R. Zhang24, X. Zhang59b, Y. Zhang15a,15d, Z. Zhang131, P. Zhao48, Y. Zhao59b, Z. Zhao59a, A. Zhemchugov78, Z. Zheng104, D. Zhong172, B. Zhou104, C. Zhou180, M.S. Zhou15a,15d, M. Zhou154, N. Zhou59c, Y. Zhou7, C.G. Zhu59b, H.L. Zhu59a, H. Zhu15a, J. Zhu104, Y. Zhu59a, X. Zhuang15a, K. Zhukov109, V. Zhulanov120b,120a, A. Zibell176, D. Zieminska64, N.I. Zimine78, S. Zimmermann51, Z. Zinonos113, M. Ziolkowski150, L. ˇ Zivkovi´c16, G. Zobernig180, A. Zoccoli23b,23a, K. Zoch52, T.G. Zorbas148, R. Zou37 and L. Zwalinski36 1Department of Physics, University of Adelaide, Adelaide; Australia 2Physics Department, SUNY Albany, Albany NY; United States of America 3Department of Physics, University of Alberta, Edmonton AB; Canada 4 (a)Department of Physics, Ankara University, Ankara;(b)Istanbul Aydin University, Istanbul;(c)Division of Physics, TOBB University of Economics and Technology, Ankara; Turkey 5LAPP, Universit´e Grenoble Alpes, Universit´e Savoie Mont Blanc, CNRS/IN2P3, Annecy; France 6High Energy Physics Division, Argonne National Laboratory, Argonne IL; United States of America 7Department of Physics, University of Arizona, Tucson AZ; United States of America 8Department of Physics, University of Texas at Arlington, Arlington TX; United States of America 9Physics Department, National and Kapodistrian University of Athens, Athens; Greece 10 Physics Department, National Technical University of Athens, Zografou; Greece 11 Department of Physics, University of Texas at Austin, Austin TX; United States of America 12 (a)Bahcesehir University, Faculty of Engineering and Natural Sciences, Istanbul;(b)Istanbul Bilgi University, Faculty of Engineering and Natural Sciences, Istanbul;(c)Department of Physics, Bogazici University, Istanbul;(d)Department of Physics Engineering, Gaziantep University, Gaziantep; Turkey 13 Institute of Physics, Azerbaijan Academy of Sciences, Baku; Azerbaijan 14 Institut de F´ısica d’Altes Energies (IFAE), Barcelona Institute of Science and Technology, Barcelona; Spain – 31 – JHEP01(2020)095 15 (a)Institute of High Energy Physics, Chinese Academy of Sciences, Beijing;(b)Physics Department, Tsinghua University, Beijing;(c)Department of Physics, Nanjing University, Nanjing;(d)University of Chinese Academy of Science (UCAS), Beijing; China 16 Institute of Physics, University of Belgrade, Belgrade; Serbia 17 Department for Physics and Technology, University of Bergen, Bergen; Norway 18 Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley CA; United States of America 19 Institut f¨ur Physik, Humboldt Universit¨at zu Berlin, Berlin; Germany 20 Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern; Switzerland 21 School of Physics and Astronomy, University of Birmingham, Birmingham; United Kingdom 22 Facultad de Ciencias y Centro de Investigaci´ones, Universidad Antonio Nari˜no, Bogota; Colombia 23 (a)INFN Bologna and Universita’ di Bologna, Dipartimento di Fisica;(b)INFN Sezione di Bologna; Italy 24 Physikalisches Institut, Universit¨at Bonn, Bonn; Germany 25 Department of Physics, Boston University, Boston MA; United States of America 26 Department of Physics, Brandeis University, Waltham MA; United States of America 27 (a)Transilvania University of Brasov, Brasov;(b)Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest;(c)Department of Physics, Alexandru Ioan Cuza University of Iasi, Iasi;(d)National Institute for Research and Development of Isotopic and Molecular Technologies, Physics Department, Cluj-Napoca;(e)University Politehnica Bucharest, Bucharest;(f)West University in Timisoara, Timisoara; Romania 28 (a)Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava;(b)Department of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice; Slovak Republic 29 Physics Department, Brookhaven National Laboratory, Upton NY; United States of America 30 Departamento de F´ısica, Universidad de Buenos Aires, Buenos Aires; Argentina 31 California State University, CA; United States of America 32 Cavendish Laboratory, University of Cambridge, Cambridge; United Kingdom 33 (a)Department of Physics, University of Cape Town, Cape Town;(b)Department of Mechanical Engineering Science, University of Johannesburg, Johannesburg;(c)Pretoria;(d)School of Physics, University of the Witwatersrand, Johannesburg; South Africa 34 Department of Physics, Carleton University, Ottawa ON; Canada 35 (a)Facult´e des Sciences Ain Chock, R´eseau Universitaire de Physique des Hautes Energies — Universit´e Hassan II, Casablanca;(b)Facult´e des Sciences, Universit´e Ibn-Tofail, K´enitra;(c)Facult´e des Sciences Semlalia, Universit´e Cadi Ayyad, LPHEA-Marrakech;(d)Facult´e des Sciences, Universit´e Mohamed Premier and LPTPM, Oujda;(e)Facult´e des sciences, Universit´e Mohammed V, Rabat; Morocco 36 CERN, Geneva; Switzerland 37 Enrico Fermi Institute, University of Chicago, Chicago IL; United States of America 38 LPC, Universit´e Clermont Auvergne, CNRS/IN2P3, Clermont-Ferrand; France 39 Nevis Laboratory, Columbia University, Irvington NY; United States of America 40 Niels Bohr Institute, University of Copenhagen, Copenhagen; Denmark 41 (a)Dipartimento di Fisica, Universit`a della Calabria, Rende;(b)INFN Gruppo Collegato di Cosenza, Laboratori Nazionali di Frascati; Italy 42 Physics Department, Southern Methodist University, Dallas TX; United States of America 43 Physics Department, University of Texas at Dallas, Richardson TX; United States of America 44 (a)Department of Physics, Stockholm University;(b)Oskar Klein Centre, Stockholm; Sweden 45 Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen; Germany 46 Lehrstuhl f¨ur Experimentelle Physik IV, Technische Universit¨at Dortmund, Dortmund; Germany 47 Institut f¨ur Kernund Teilchenphysik, Technische Universit¨at Dresden, Dresden; Germany 48 Department of Physics, Duke University, Durham NC; United States of America – 32 – JHEP01(2020)095 49 SUPA — School of Physics and Astronomy, University of Edinburgh, Edinburgh; United Kingdom 50 INFN e Laboratori Nazionali di Frascati, Frascati; Italy 51 Physikalisches Institut, Albert-Ludwigs-Universit¨at Freiburg, Freiburg; Germany 52 II. Physikalisches Institut, Georg-August-Universit¨at G¨ottingen, G¨ottingen; Germany 53 D´epartement de Physique Nucl´eaire et Corpusculaire, Universit´e de Gen`eve, Gen`eve; Switzerland 54 (a)Dipartimento di Fisica, Universit`a di Genova, Genova;(b)INFN Sezione di Genova; Italy 55 II. Physikalisches Institut, Justus-Liebig-Universit¨at Giessen, Giessen; Germany 56 SUPA — School of Physics and Astronomy, University of Glasgow, Glasgow; United Kingdom 57 LPSC, Universit´e Grenoble Alpes, CNRS/IN2P3, Grenoble INP, Grenoble; France 58 Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge MA; United States of America 59 (a)Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei;(b)Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Qingdao;(c)School of Physics and Astronomy, Shanghai Jiao Tong University, KLPPAC-MoE, SKLPPC, Shanghai;(d)Tsung-Dao Lee Institute, Shanghai; China 60 (a)Kirchhoff-Institut f¨ur Physik, Ruprecht-Karls-Universit¨at Heidelberg, Heidelberg;(b)Physikalisches Institut, Ruprecht-Karls-Universit¨at Heidelberg, Heidelberg; Germany 61 Faculty of Applied Information Science, Hiroshima Institute of Technology, Hiroshima; Japan 62 (a)Department of Physics, Chinese University of Hong Kong, Shatin, N.T., Hong Kong;(b)Department of Physics, University of Hong Kong, Hong Kong;(c)Department of Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong; China 63 Department of Physics, National Tsing Hua University, Hsinchu; Taiwan 64 Department of Physics, Indiana University, Bloomington IN; United States of America 65 (a)INFN Gruppo Collegato di Udine, Sezione di Trieste, Udine;(b)ICTP, Trieste;(c)Dipartimento Politecnico di Ingegneria e Architettura, Universit`a di Udine, Udine; Italy 66 (a)INFN Sezione di Lecce;(b)Dipartimento di Matematica e Fisica, Universit`a del Salento, Lecce; Italy 67 (a)INFN Sezione di Milano;(b)Dipartimento di Fisica, Universit`a di Milano, Milano; Italy 68 (a)INFN Sezione di Napoli;(b)Dipartimento di Fisica, Universit`a di Napoli, Napoli; Italy 69 (a)INFN Sezione di Pavia;(b)Dipartimento di Fisica, Universit`a di Pavia, Pavia; Italy 70 (a)INFN Sezione di Pisa;(b)Dipartimento di Fisica E. Fermi, Universit`a di Pisa, Pisa; Italy 71 (a)INFN Sezione di Roma;(b)Dipartimento di Fisica, Sapienza Universit`a di Roma, Roma; Italy 72 (a)INFN Sezione di Roma Tor Vergata;(b)Dipartimento di Fisica, Universit`a di Roma Tor Vergata, Roma; Italy 73 (a)INFN Sezione di Roma Tre;(b)Dipartimento di Matematica e Fisica, Universit`a Roma Tre, Roma; Italy 74 (a)INFN-TIFPA;(b)Universit`a degli Studi di Trento, Trento; Italy 75 Institut f¨ur Astround Teilchenphysik, Leopold-Franzens-Universit¨at, Innsbruck; Austria 76 University of Iowa, Iowa City IA; United States of America 77 Department of Physics and Astronomy, Iowa State University, Ames IA; United States of America 78 Joint Institute for Nuclear Research, Dubna; Russia 79 (a)Departamento de Engenharia El´etrica, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora;(b)Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro;(c)Universidade Federal de S˜ao Jo˜ao del Rei (UFSJ), S˜ao Jo˜ao del Rei;(d)Instituto de F´ısica, Universidade de S˜ao Paulo, S˜ao Paulo; Brazil 80 KEK, High Energy Accelerator Research Organization, Tsukuba; Japan 81 Graduate School of Science, Kobe University, Kobe; Japan 82 (a)AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow;(b)Marian Smoluchowski Institute of Physics, Jagiellonian University, Krakow; Poland 83 Institute of Nuclear Physics Polish Academy of Sciences, Krakow; Poland – 33 – JHEP01(2020)095 84 Faculty of Science, Kyoto University, Kyoto; Japan 85 Kyoto University of Education, Kyoto; Japan 86 Research Center for Advanced Particle Physics and Department of Physics, Kyushu University, Fukuoka; Japan 87 Instituto de F´ısica La Plata, Universidad Nacional de La Plata and CONICET, La Plata; Argentina 88 Physics Department, Lancaster University, Lancaster; United Kingdom 89 Oliver Lodge Laboratory, University of Liverpool, Liverpool; United Kingdom 90 Department of Experimental Particle Physics, Joˇzef Stefan Institute and Department of Physics, University of Ljubljana, Ljubljana; Slovenia 91 School of Physics and Astronomy, Queen Mary University of London, London; United Kingdom 92 Department of Physics, Royal Holloway University of London, Egham; United Kingdom 93 Department of Physics and Astronomy, University College London, London; United Kingdom 94 Louisiana Tech University, Ruston LA; United States of America 95 Fysiska institutionen, Lunds universitet, Lund; Sweden 96 Centre de Calcul de l’Institut National de Physique Nucl´eaire et de Physique des Particules (IN2P3), Villeurbanne; France 97 Departamento de F´ısica Teorica C-15 and CIAFF, Universidad Aut´onoma de Madrid, Madrid; Spain 98 Institut f¨ur Physik, Universit¨at Mainz, Mainz; Germany 99 School of Physics and Astronomy, University of Manchester, Manchester; United Kingdom 100 CPPM, Aix-Marseille Universit´e, CNRS/IN2P3, Marseille; France 101 Department of Physics, University of Massachusetts, Amherst MA; United States of America 102 Department of Physics, McGill University, Montreal QC; Canada 103 School of Physics, University of Melbourne, Victoria; Australia 104 Department of Physics, University of Michigan, Ann Arbor MI; United States of America 105 Department of Physics and Astronomy, Michigan State University, East Lansing MI; United States of America 106 B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk; Belarus 107 Research Institute for Nuclear Problems of Byelorussian State University, Minsk; Belarus 108 Group of Particle Physics, University of Montreal, Montreal QC; Canada 109 P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow; Russia 110 National Research Nuclear University MEPhI, Moscow; Russia 111 D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow; Russia 112 Fakult¨at f¨ur Physik, Ludwig-Maximilians-Universit¨at M¨unchen, M¨unchen; Germany 113 Max-Planck-Institut f¨ur Physik (Werner-Heisenberg-Institut), M¨unchen; Germany 114 Nagasaki Institute of Applied Science, Nagasaki; Japan 115 Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya; Japan 116 Department of Physics and Astronomy, University of New Mexico, Albuquerque NM; United States of America 117 Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen; Netherlands 118 Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam; Netherlands 119 Department of Physics, Northern Illinois University, DeKalb IL; United States of America 120 (a)Budker Institute of Nuclear Physics and NSU, SB RAS, Novosibirsk;(b)Novosibirsk State University Novosibirsk; Russia 121 Institute for High Energy Physics of the National Research Centre Kurchatov Institute, Protvino; Russia 122 Institute for Theoretical and Experimental Physics named by A.I. Alikhanov of National Research Centre “Kurchatov Institute”, Moscow; Russia 123 Department of Physics, New York University, New York NY; United States of America – 34 – JHEP01(2020)095 124 Ochanomizu University, Otsuka, Bunkyo-ku, Tokyo; Japan 125 Ohio State University, Columbus OH; United States of America 126 Faculty of Science, Okayama University, Okayama; Japan 127 Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman OK; United States of America 128 Department of Physics, Oklahoma State University, Stillwater OK; United States of America 129 Palack´y University, RCPTM, Joint Laboratory of Optics, Olomouc; Czech Republic 130 Center for High Energy Physics, University of Oregon, Eugene OR; United States of America 131 LAL, Universit´e Paris-Sud, CNRS/IN2P3, Universit´e Paris-Saclay, Orsay; France 132 Graduate School of Science, Osaka University, Osaka; Japan 133 Department of Physics, University of Oslo, Oslo; Norway 134 Department of Physics, Oxford University, Oxford; United Kingdom 135 LPNHE, Sorbonne Universit´e, Universit´e de Paris, CNRS/IN2P3, Paris; France 136 Department of Physics, University of Pennsylvania, Philadelphia PA; United States of America 137 Konstantinov Nuclear Physics Institute of National Research Centre “Kurchatov Institute”, PNPI, St. Petersburg; Russia 138 Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh PA; United States of America 139 (a)Laborat´orio de Instrumenta¸c˜ao e F´ısica Experimental de Part´ıculas — LIP, Lisboa;(b)Departamento de F´ısica, Faculdade de Ciˆencias, Universidade de Lisboa, Lisboa;(c)Departamento de F´ısica, Universidade de Coimbra, Coimbra;(d)Centro de F´ısica Nuclear da Universidade de Lisboa, Lisboa;(e)Departamento de F´ısica, Universidade do Minho, Braga;(f)Departamento de F´ısica Te´orica y del Cosmos, Universidad de Granada, Granada (Spain);(g)Dep F´ısica and CEFITEC of Faculdade de Ciˆencias e Tecnologia, Universidade Nova de Lisboa, Caparica;(h)Instituto Superior T´ecnico, Universidade de Lisboa, Lisboa; Portugal 140 Institute of Physics of the Czech Academy of Sciences, Prague; Czech Republic 141 Czech Technical University in Prague, Prague; Czech Republic 142 Charles University, Faculty of Mathematics and Physics, Prague; Czech Republic 143 Particle Physics Department, Rutherford Appleton Laboratory, Didcot; United Kingdom 144 IRFU, CEA, Universit´e Paris-Saclay, Gif-sur-Yvette; France 145 Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz CA; United States of America 146 (a)Departamento de F´ısica, Pontificia Universidad Cat´olica de Chile, Santiago;(b)Universidad Andres Bello, Department of Physics, Santiago;(c)Departamento de F´ısica, Universidad T´ecnica Federico Santa Mar´ıa, Valpara´ıso; Chile 147 Department of Physics, University of Washington, Seattle WA; United States of America 148 Department of Physics and Astronomy, University of Sheffield, Sheffield; United Kingdom 149 Department of Physics, Shinshu University, Nagano; Japan 150 Department Physik, Universit¨at Siegen, Siegen; Germany 151 Department of Physics, Simon Fraser University, Burnaby BC; Canada 152 SLAC National Accelerator Laboratory, Stanford CA; United States of America 153 Physics Department, Royal Institute of Technology, Stockholm; Sweden 154 Departments of Physics and Astronomy, Stony Brook University, Stony Brook NY; United States of America 155 Department of Physics and Astronomy, University of Sussex, Brighton; United Kingdom 156 School of Physics, University of Sydney, Sydney; Australia 157 Institute of Physics, Academia Sinica, Taipei; Taiwan 158 (a)E. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi;(b)High Energy Physics Institute, Tbilisi State University, Tbilisi; Georgia 159 Department of Physics, Technion, Israel Institute of Technology, Haifa; Israel 160 Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv; Israel – 35 – JHEP01(2020)095 161 Department of Physics, Aristotle University of Thessaloniki, Thessaloniki; Greece 162 International Center for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo; Japan 163 Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo; Japan 164 Department of Physics, Tokyo Institute of Technology, Tokyo; Japan 165 Tomsk State University, Tomsk; Russia 166 Department of Physics, University of Toronto, Toronto ON; Canada 167 (a)TRIUMF, Vancouver BC;(b)Department of Physics and Astronomy, York University, Toronto ON; Canada 168 Division of Physics and Tomonaga Center for the History of the Universe, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba; Japan 169 Department of Physics and Astronomy, Tufts University, Medford MA; United States of America 170 Department of Physics and Astronomy, University of California Irvine, Irvine CA; United States of America 171 Department of Physics and Astronomy, University of Uppsala, Uppsala; Sweden 172 Department of Physics, University of Illinois, Urbana IL; United States of America 173 Instituto de F´ısica Corpuscular (IFIC), Centro Mixto Universidad de Valencia — CSIC, Valencia; Spain 174 Department of Physics, University of British Columbia, Vancouver BC; Canada 175 Department of Physics and Astronomy, University of Victoria, Victoria BC; Canada 176 Fakult¨at f¨ur Physik und Astronomie, Julius-Maximilians-Universit¨at W¨urzburg, W¨urzburg; Germany 177 Department of Physics, University of Warwick, Coventry; United Kingdom 178 Waseda University, Tokyo; Japan 179 Department of Particle Physics, Weizmann Institute of Science, Rehovot; Israel 180 Department of Physics, University of Wisconsin, Madison WI; United States of America 181 Fakult¨at f¨ur Mathematik und Naturwissenschaften, Fachgruppe Physik, Bergische Universit¨at Wuppertal, Wuppertal; Germany 182 Department of Physics, Yale University, New Haven CT; United States of America 183 Yerevan Physics Institute, Yerevan; Armenia aAlso at Borough of Manhattan Community College, City University of New York, New York NY; United States of America bAlso at Centre for High Performance Computing, CSIR Campus, Rosebank, Cape Town; South Africa cAlso at CERN, Geneva; Switzerland dAlso at CPPM, Aix-Marseille Universit´e, CNRS/IN2P3, Marseille; France eAlso at D´epartement de Physique Nucl´eaire et Corpusculaire, Universit´e de Gen`eve, Gen`eve; Switzerland fAlso at Departament de Fisica de la Universitat Autonoma de Barcelona, Barcelona; Spain gAlso at Departamento de F´ısica Te´orica y del Cosmos, Universidad de Granada, Granada (Spain); Spain hAlso at Department of Applied Physics and Astronomy, University of Sharjah, Sharjah; United Arab Emirates iAlso at Department of Financial and Management Engineering, University of the Aegean, Chios; Greece jAlso at Department of Physics and Astronomy, University of Louisville, Louisville, KY; United States of America kAlso at Department of Physics and Astronomy, University of Sheffield, Sheffield; United Kingdom lAlso at Department of Physics, California State University, East Bay; United States of America mAlso at Department of Physics, California State University, Fresno; United States of America nAlso at Department of Physics, California State University, Sacramento; United States of America – 36 – JHEP01(2020)095 oAlso at Department of Physics, King’s College London, London; United Kingdom pAlso at Department of Physics, St. Petersburg State Polytechnical University, St. Petersburg; Russia qAlso at Department of Physics, Stanford University, Stanford CA; United States of America rAlso at Department of Physics, University of Fribourg, Fribourg; Switzerland sAlso at Department of Physics, University of Michigan, Ann Arbor MI; United States of America tAlso at Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow; Russia uAlso at Giresun University, Faculty of Engineering, Giresun; Turkey vAlso at Graduate School of Science, Osaka University, Osaka; Japan wAlso at Hellenic Open University, Patras; Greece xAlso at Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest; Romania yAlso at Institucio Catalana de Recerca i Estudis Avancats, ICREA, Barcelona; Spain zAlso at Institut f¨ur Experimentalphysik, Universit¨at Hamburg, Hamburg; Germany aa Also at Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen; Netherlands ab Also at Institute for Nuclear Research and Nuclear Energy (INRNE) of the Bulgarian Academy of Sciences, Sofia; Bulgaria ac Also at Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Budapest; Hungary ad Also at Institute of Particle Physics (IPP), Vancouver; Canada ae Also at Institute of Physics, Academia Sinica, Taipei; Taiwan af Also at Institute of Physics, Azerbaijan Academy of Sciences, Baku; Azerbaijan ag Also at Institute of Theoretical Physics, Ilia State University, Tbilisi; Georgia ah Also at Istanbul University, Dept. of Physics, Istanbul; Turkey ai Also at Joint Institute for Nuclear Research, Dubna; Russia aj Also at LAL, Universit´e Paris-Sud, CNRS/IN2P3, Universit´e Paris-Saclay, Orsay; France ak Also at Louisiana Tech University, Ruston LA; United States of America al Also at LPNHE, Sorbonne Universit´e, Universit´e de Paris, CNRS/IN2P3, Paris; France am Also at Manhattan College, New York NY; United States of America an Also at Moscow Institute of Physics and Technology State University, Dolgoprudny; Russia ao Also at National Research Nuclear University MEPhI, Moscow; Russia ap Also at Physics Department, An-Najah National University, Nablus; Palestine aq Also at Physikalisches Institut, Albert-Ludwigs-Universit¨at Freiburg, Freiburg; Germany ar Also at School of Physics, Sun Yat-sen University, Guangzhou; China as Also at The City College of New York, New York NY; United States of America at Also at The Collaborative Innovation Center of Quantum Matter (CICQM), Beijing; China au Also at Tomsk State University, Tomsk, and Moscow Institute of Physics and Technology State University, Dolgoprudny; Russia av Also at TRIUMF, Vancouver BC; Canada aw Also at Universita di Napoli Parthenope, Napoli; Italy ∗Deceased – 37 –