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PreprintarXiv licencearXiv

Collision energy and system size dependence of pT-differential radial flow fluctuations v0(pT) at RHIC

  • Zaining Wang
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Abstract

We report the first RHIC measurements of v0(pT) in Au+Au collisions at √(sNN)=7.7--$200$ GeV and O+O collisions at √(sNN)=200 GeV. The integral fluctuation v0 follows a common Nch dependence in large and small systems, suggesting that the fluctuation magnitude is predominantly controlled by event-by-event fluctuations of the initial transverse size. The normalized response v0(pT)/v0 factorizes across centralities and systems, revealing a universal hydrodynamic response κ0(pT)/κ0 largely independent of the fluctuation amplitude. Identified-hadron mass ordering and viscous model comparisons demonstrate sensitivity to bulk viscosity (ζ/s). These results establish v0(pT) as a probe of the radial hydrodynamic response, collectivity across large and small collision systems, and QGP transport properties.

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Cite

BibTeXRIS
BibTeX
@misc{wang2026collision,
  title = {{Collision energy and system size dependence of $p_\mathrmT$-differential radial flow fluctuations $v_0(p_\mathrmT)$ at RHIC}},
  author = {Zaining Wang},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2608.00190},
  eprint = {2608.00190},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.00190},
}
RIS
TY  - UNPB
TI  - Collision energy and system size dependence of p_T-differential radial flow fluctuations v_0(p_T) at RHIC
AU  - Zaining Wang
PY  - 2026
DA  - 2026/09/11
PB  - arXiv
DO  - 10.48550/arxiv.2608.00190
UR  - https://arxiv.org/abs/2608.00190
AB  - We report the first RHIC measurements of v_0(p_T) in Au+Au collisions at √(s_NN)=7.7--$200$ GeV and O+O collisions at √(s_NN)=200 GeV. The integral fluctuation v_0 follows a common N_ch dependence in large and small systems, suggesting that the fluctuation magnitude is predominantly controlled by event-by-event fluctuations of the initial transverse size. The normalized response v_0(p_T)/v_0 factorizes across centralities and systems, revealing a universal hydrodynamic response κ_0(p_T)/κ_0 largely independent of the fluctuation amplitude. Identified-hadron mass ordering and viscous model comparisons demonstrate sensitivity to bulk viscosity (ζ/s). These results establish v_0(p_T) as a probe of the radial hydrodynamic response, collectivity across large and small collision systems, and QGP transport properties.
ER  -