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Effects of initial state fluctuations on the mean transverse momentum

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arxiv 2002.07008 v1 pith:ULUPMS3D submitted 2020-02-17 nucl-th hep-phnucl-ex

Fernando G. Gardim , Giuliano Giacalone , Matthew Luzum , Jean-Yves Ollitrault This is my paper · ORCID
classification nucl-thhep-phnucl-ex
keywords initialfluctuationsstatelanglelargermeanmomentumrangle
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abstract

We show that in ideal hydrodynamic simulations of heavy-ion collisions, initial state fluctuations result in an increase of the mean transverse momentum of outgoing hadrons, $\langle p_t\rangle$. Specifically, $\langle p_t\rangle$ is larger by a few percent if realistic fluctuations are implemented than with smooth initial conditions, the multiplicity and impact parameter being kept fixed. We show that result can be traced back to the fact that for a given total entropy, the initial energy contained in the fluid is larger if the density profile is bumpy. We discuss the implication of these results for the extraction of the equation of state of QCD from experimental data.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Thermal and geometric normal modes of spectral fluctuations in heavy-ion collisions

    nucl-th 2026-04 unverdicted novelty 7.0 of 10

    Rotated PCA of simulated Pb+Pb spectra separates spectral fluctuations into a coherent thermal mode that fully explains v0(pT) and a double-node geometric mode that drives the low-pT sign change of v02(pT).

  2. Extracting the speed of sound of QCD from transverse momentum fluctuations

    hep-ph 2026-03 conditional novelty 7.0 of 10

    From ATLAS data on transverse-momentum fluctuations in ultra-central Pb+Pb collisions, the QGP speed of sound is extracted as 0.496 ± 0.008 at 221 ± 13 MeV, matching lattice QCD.

  3. Impacts of isolated nucleon-nucleon correlations in relativistic $^{16}$O+$^{16}$O collisions

    nucl-th 2025-08 conditional novelty 6.0 of 10

    Applying rejection sampling to 16O configurations constrained by a Fermi density and a two-nucleon distance distribution reproduces the initial-state eccentricities and energy fluctuations of NLEFT and VMC ab-initio m...

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