Charged particle production in Pb-Pb and p-Pb collisions measured by the ATLAS detector

15th International Conference on Strangeness in Quark Matter

Shulga, Evgeny^1

National Research Nuclear University mEPhI, Kashirskoe shosse 31, Moscow, Russia^1

关键词: ATLAS detectors;    ATLAS experiment;    Centre-of-mass energies;    Collision systems;    Large Hadron Collider;    Nuclear modification factors;    Particle production;    Transverse momenta;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/668/1/012078/pdf
DOI  :  10.1088/1742-6596/668/1/012078

来源: IOP

【 摘 要 】

The ATLAS experiment at the Large Hadron Collider measures charged hadron spectra in Pb+Pb and p+Pb collisions. The results are compared to the pp spectra of charged hadrons at the same centre-of-mass energy. Charged hadron distributions from Pb+Pb are compared to charged particle cross-sections in pp collisions at √s= 2.76 TeV, reference crosssection for p+Pb at √s NN = 5.02 TeV is reconstructed using √s = 2.76 TeV and 7 TeV pp results. These allow for a detailed comparison of the collision systems in a wide transverse momentum and rapidity ranges in different centrality intervals. The nuclear modification factors RAAand RpPbare presented as a function of centrality, pT, η The charged particle RAAis found to vary significantly as a function of transverse momentum, and shows a pronounced minimum at about 7 GeV. Above 60 GeV, RAAis consistent with a flat, centrality-dependent, value within the uncertainties. RpPbresults show strong rapidity dependence in the region of so-called Cronin peak at about 2 GeV and above pTof 10 GeV show anomalous enhancement.