Higher-order transverse momentum fluctuations in heavy-ion collisions

Abstract

In relativistic heavy-ion collisions, the event-by-event mean transverse momentum fluctuations are sensitive to overlap area and energy density fluctuations in initial state. We present a framework to calculate $p_{\mathrm{T}}$ fluctuations up to $4^{\mathrm{th}}$-order using standard and subevent methods, which is validated using the HIJING model. We observe a power-law dependence for cumulants of all orders as a function of charged particle multiplicity $N_{\mathrm{ch}}$, consistent with a simple independent source picture. The fluctuation in $pp$ collisions is observed to be larger than for $p+$Pb, Pb+Pb and Xe+Xe collisions at the same $N_{\mathrm{ch}}$ due to bias in number of contributing sources. The short-range correlations are greatly suppressed in subevent method in comparison to calculations based on the standard method. This study provides a baseline for transverse momentum fluctuations without the presence of final state effects.

5 pages, 4 figures, replace with published version

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• Triangularity and Dipole Asymmetry in Heavy Ion Collisions
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Cited by in corpus (7)

• Imaging Shapes of Atomic Nuclei in High-Energy Nuclear Collisions
• Disentangling sources of momentum fluctuations in Xe+Xe and Pb+Pb collisions with the ATLAS detector
• Non-Gaussian transverse momentum fluctuations from impact parameter fluctuations
• System size and energy dependence of the mean transverse momentum fluctuations at the LHC
• Study of $⟨p_{\mathrm{T}}⟩$ and its higher moments, and extraction of the speed of sound in Pb-Pb collisions with ALICE
• An overview of new measurements of flow, chirality, and vorticity from STAR experiment
• Bayesian reconstruction of anisotropic flow fluctuations at fixed impact parameter