2012/09/24 by A. Tawfik, Tawfik, A., E. Gamal +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th) #hep-ph #nucl-th
paper · pdf · doi:10.48550/arxiv.1209.5379
7 pages, 4 eps figures
arxiv created 2012/09/24 · arxiv updated 2012/09/27
The production of different particle species is recently measured in Pb-Pb collisions by the ALICE experiment at √(s)=7 TeV. This motivates the use of various bosons and baryons measured at lower center-of-mass energies in comparing their ratios to the hadron resonance (HRG) gas model and PYTHIA event generator. It is found that the particle-to-antiparticle ratios are perfectly reproduce by means of HRG and PYTHIA at RHIC and LHC energies. The kaon-to-pion and proton-to-pion ratios are entirely overestimated by the HRG model. The PYTHIA event generator obviously underestimates the kaon-to-pion ratio and simultaneously reproduces the proton-to-pion ratio, almost perfectly, especially at LHC energy. While matter-to-antimatter and non-strange abundances are partly in line with predictions from the HRG model, it is found in the ALICE experiment that the measured baryon ratios are suppressed by a factor of ∼1.5. The strange abundances are overestimated in the HRG model.