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

Abstract

A measurement of the production of a prompt J/ψ meson in association with a W ± 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 |y J/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.

$J/ψ$ associated production with a bottom quark pair from the Higgs boson decay in next-to-leading order QCD

“…In the past two decades, many works have considered the contribution of higher-order corrections to heavy quarkonium and achieved remarkable successes in phenomenologically(see the review [27] and its references). However, NRQCD still faces challenges, such as the universality of LDMEs [20,28], the kinematic distribution of J/ψ + W ± measured by ATLAS [29,30], and the polarization problem of χ c1 and χ c2 [31] have not been fully explained. In order to study the production mechanism of heavy quarkonium, we should study more the production process of heavy quarkonium at different colliders.…”

Prospects for quarkonium studies at the high-luminosity LHC

“…Fig. 9 (Left) illustrates how rates of J/ψ + W production can be described by NLO CEM predictions together with a DPS contribution with an effective cross section of σ eff = 6.1 +3.3 −1.9 +0.1 −0.3 mb [141], compatible with the minimum of 6.3 ± 1.9 mb determined by ATLAS [137] and with the lower (68% C.L.) limit of 5.3 mb determined in the J/ψ + Z process.…”

ATLAS results on charmonium production and $B_c$ production and decays

“…Associated production of 𝐽/𝜓 and 𝑊 ± boson was measured using the dataset collected at √ 𝑠 = 8 TeV in 2012 [5]. This process can occur via single (SPS) or double parton scattering (DPS) mechanism.…”