2025/05/21 by Bushra Ali, Ali, Bushra
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2505.15161
Event-by-event fluctuations of the mean transverse momentum (p\rm T) of relativistic charged particles are analyzed using the two-particle correlator √(Cm)/M(p\rm T)m, which quantifies the correlations strength in units of the mean p\rm T in proton-proton collision at √(s) = 13 TeV in ALICE both for minimum bias and and high-multiplicity triggered events. The non-monotonic variations in p\rm T correlations with changing energy could serve as a signature of QGP formation. A comprehensive investigation across soft-, intermediate-, and hard-p\rm T regions could provide crucial insights into both equilibrium (e.g., thermal radial flow) and non-equilibrium (e.g., jet/minijet) contributions to p\rm T fluctuations. The dependence of the correlator on particle multiplicity for different p\rm T window widths and positions is explored. The correlator values are found to decrease with increasing charged particle density, following a power-law behavior similar to observations in both small and large systems at lower energies. Additionally, the influence of p\rm T range on the power-law coefficient is studied and results are compared with predictions from Monte Carlo models, such as PYTHIA (pQCD string model) and EPOS (core-corona model), to enhance understanding of the underlying mechanisms driving p\rm T fluctuations.