Heavy ion physics at LHCb

8th International Workshop on Hadron Physics

Rangel, Murilo^1

Universidade Federal Do Rio de Janeiro, Brazil^1

关键词: B-hadron decays;    Centre-of-mass energies;    Heavy ion physics;    Integrated luminosity;    Kinematic range;    Lead collisions;    LHC experiments;    Nuclear modification factors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/706/4/042014/pdf
DOI  :  10.1088/1742-6596/706/4/042014

来源: IOP

【 摘 要 】

Proton-ion collisions are probed in the forward acceptance by the LHCb detector in a unique kinematic range, complementary to the other LHC experiments. The production of J/ψ and decaying into two muons is studied in proton-lead collisions at a proton-nucleon centre-of-mass energy √sNN = 5 TeV. The results are based on a data sample corresponding to an integrated luminosity of 1.6 nb-1. The nuclear modification factor and the forward-backward production ratio are determined for J/ψ and (1S) mesons. Significant suppression of prompt J/ψ production is observed with respect to the production in pp collisions at large rapidity, while the suppression of J/ψ from b-hadron decays is less pronounced. The nuclear modification factor for (1S) mesons in the forward region is found to be similar to those for J/ψ from b-hadron decays. First observation of Z bosons in proton-lead collisions at a proton-nucleon centre-of-mass energy √sNN = 5 TeV is also reported.