Higher-order transverse momentum fluctuations in heavy-ion collisions

Bhatta, Somadutta; Zhang, Chunjian; Jia, Jiangyong

doi:10.1103/physrevc.105.024904

Title: Higher-order transverse momentum fluctuations in heavy-ion collisions

Journal Article · 07 February 2022 · Physical Review. C

DOI: https://doi.org/10.1103/physrevc.105.024904 · OSTI ID:1979860

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Stony Brook Univ., NY (United States); OSTI
Stony Brook Univ., NY (United States)
Stony Brook Univ., NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

In relativistic heavy-ion collisions, the event-by-event mean transverse momentum fluctuations are sensitive to overlap area and energy density fluctuations in the initial state. We present a framework to calculate p_T fluctuations up to fourth 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_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_ch due to bias in the number of contributing sources. The short-range correlations are greatly suppressed in the subevent method in comparison to calculations based on the standard method. This paper provides a baseline for transverse momentum fluctuations without the presence of final-state effects.

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Research Organization:: State Univ. of New York (SUNY), Albany, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-87ER40331

OSTI ID:: 1979860

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 105; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Higher-order transverse momentum fluctuations in heavy-ion collisions

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