Event-by-event fluctuations of the mean transverse momentum (p ₓ) of relativistic charged particles are analyzed using the two-particle correlator Cₘ/M (p ₓ) ₘ, which quantifies the correlations strength in units of the mean p ₓ 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 ₓ correlations with changing energy could serve as a signature of QGP formation. A comprehensive investigation across soft-, intermediate-, and hard-p ₓ regions could provide crucial insights into both equilibrium (e. g. , thermal radial flow) and non-equilibrium (e. g. , jet/minijet) contributions to p ₓ fluctuations. The dependence of the correlator on particle multiplicity for different p ₓ 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 ₓ 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 ₓ fluctuations.
Bushra Ali (Wed,) studied this question.
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