2015/01/01 by S. T. Heckel
Physics and Astronomy · #Astrophysics #Collision #Event (particle physics) #Heavy ion #High-Energy Particle Collisions Research #Impact parameter #Ion #Large Hadron Collider #Monte Carlo method #Multiplicity (mathematics) #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quark #Quark–gluon plasma #Statistics #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1051/epjconf/20159008006
6 pages, 7 figures, proceedings to the XLIV International Symposium on Multiparticle Dynamics (ISMD) 2014, Bologna, Italy
openalex publication_date 2015/01/01 · arxiv created 2015/02/02 · openalex created_date 2019/06/27 · arxiv updated 2019/08/13 · openalex updated_date 2026/08/05
The ALICE detector at the LHC is used to study the properties of the Quark-Gluon Plasma produced in heavy-ion collisions. As a reference measurement, also the analysis of proton-proton (pp) collisions is very important. In the study presented here, event-by-event fluctuations of the mean transverse momentum are analysed in pp collisions at √s = 0.9, 2.76 and 7 TeV, and Pb–Pb collisions at √sNN = 2.76 TeV as a function of the charged-particle multiplicity. In both systems, dynamical fluctuations beyond the statistical expectation are observed. In pp collisions, no significant dependence on collision energy is found, even in comparison to inclusive results at much lower collision energies. Likewise, central A–A collisions show only little dependence on collision energy. The multiplicity dependence observed in peripheral Pb–Pb data is in agreement with that in pp collisions. Going to more central Pb–Pb collisions, a clear deviation from this trend is found, reaching a significant reduction of the fluctuations in most central collisions. Comparisons toMonte Carlo event generators show good agreement in pp, but rather large differences in Pb–Pb collisions.