Speaker
Description
Event-by-event mean transverse momentum fluctuations (⟨pT ⟩) offer a sensitive probe of initial state overlap area and energy density fluctuations in relativistic heavy-ion collisions. We investigate these fluctuations in Au+Au collisions at 3.0–19.6 GeV, focusing on the centrality and energy dependence using an improved multiphase transport (AMPT) model. A power-law dependence of pT cumulants on centrality is observed, consistent with the independent source picture.
Normalized mean transverse momentum ⟨pT⟩ fluctuations and scaled cumulants are conducted, with variances aligning well with the trends observed in experimental data. Using a two-subevents method, short-range correlations are slightly suppressed compared to the standard approach. These findings potentially establish a robust framework for investigating initial state fluctuations across different energies in heavy-ion collisions.
