期刊
PHYSICS LETTERS B
卷 781, 期 -, 页码 485-491出版社
ELSEVIER
DOI: 10.1016/j.physletb.2018.04.020
关键词
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资金
- French IN2P3-CNRS via the LIA FCPPL (Quarkonium4AFTER)
- project TMD@NLO
- ILP Labex [ANR-11-IDEX-0004-02, ANR-10-LABX-63]
- JSPS Postdoctoral Fellowship
- Riken iTHES Project
We re-analyse the associated production of a prompt J/psi and a W boson in pp collisions at the LHC following the results of the ATLAS Collaboration. We perform the first study of the Single-Parton Scattering (SPS) contributions at the Next-to-Leading Order (NLO) in alpha(s) in the Colour-Evaporation Model (CEM), an approach based on the quark-hadron-duality. Our study provides clear indications for Double-Parton-Scattering (DPS) contributions, in particular at low transverse momenta, since our SPS CEM evaluation, which can be viewed as a conservative upper limit of the SPS yields, falls short compared to the ATLAS experimental data by 3.1 standard deviations. We also determine a finite allowed region for sigma(eff), inversely proportional to the size of the DPS yields, corresponding to the otherwise opposed hypotheses, namely our NLO CEM evaluation and the LO direct Colour-Singlet (CS) Model contribution. In both cases, the resulting DPS yields are significantly larger than that initially assumed by ATLAS based on jet-related analyses but is consistent with their observed raw-yield azimuthal distribution and with their prompt J/psi + J/psi and Z+ prompt J/psi data. (C) 2018 The Author(s). Published by Elsevier B.V.
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