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2025-11-04 14:21

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Conference: Bucharest University Faculty of Physics 2019 Meeting

Section: Nuclear and Elementary Particles Physics

Title:

Production of heavy quarkonium in proton-proton collisions at LHC for the forward rapidity region

Authors:

Simona DÎRLECI(1,2)

Affiliation:

1)Faculty of Physics, University of Bucharest, 405 Atomistilor Street, Magurele, Romania

2)Horia Hulubei National Institute for Physics and Nuclear Engineering, Reactorului 30, RO-077125, P.O.B. MG-6, Bucharest-Magurele, Romania

E-mail

simona.dirleci@nipne.ro

Keywords:

LHC, event generator, heavy quarkonium, NRQCD

Abstract:

The current theoretical description of heavy quarkonia production in high energy collisions is based on both perturbative and non-perturbative methods in the frame of non-relativistic quantum chromodynamics (NRQCD). While the perturbative short-distance creation of a quark-antiquark pair is well-understood, its non-perturbative evolution into the colourless bound state remains an open problem to be presumably solved using experimental data. LHCb measured the J/ψ production cross-section [1] in pp collisions at a center-of-mass energy of 7 TeV using data recorded in 2010. Differential cross-sections for prompt J/ψ and J/ψ produced in b-hadron decays were measured in the fiducial kinematic region described in terms of meson rapidity, 2.0 < y < 4.5, and transverse momentum, pT<14 GeV/c. These results were compared to theoretical predictions based on NRQCD [2]. Using the measurement distributions encoded in the HepData portal [3] as reference, a RIVET [4] analysis module is developed and tested against predictions of PYTHIA 8.240 [5] configurations minimally altered to generate the two classes of quarkonia mesons.

References:

[1] The LHCb Collaboration, "Measurement of J/ψ production in pp collisions at √s = 7 TeV," Eur. Phys. J. C71 (2011) 1645, arXiv:1103.0423.

[2] M. Cacciari et al., "Theoretical predictions for charm and bottom production at the LHC," JHEP 10 (2012) 137, arXiv:1205.6344.

[3] www.hepdata.net

[4] Andy Buckley et al., "Rivet User Manual, arXiv:1003.0694 [hep-ph]," [Online].

[5] Torbjörn Sjöstrand et al. (PYTHIA collaboration), "An Introduction to PYTHIA 8.2".Comp. Phys. Comm. 191 (2015) 159-177; arXiv: 1410.3012 [hep-ph].