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PreprintCC BY-NC-ND 4.0arXiv

Robustness of the scaled transverse-momentum correlator and the contribution of meson--baryon fluctuations at RHIC energies

  • Rutik Manikandhan
  • Rene Bellwied
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Abstract

The search for the QCD critical point relies on identifying non-monotonic signatures in event-by-event fluctuation observables, such as the scaled two-particle transverse-momentum correlator CpT. Using a microscopic transport model (UrQMD), we establish the robustness of CpT against the variations that distinguish the datasets in the relevant collision energy regime, namely the choice of centrality estimator, finite tracking efficiency, and acceptance, including the difference between collider and fixed-target running. In addition, it has recently been proposed, based on UrQMD yields, that the measured non-monotonicity requires no critical dynamics and instead follows from the event-by-event composition of the final state. We show that this contribution is governed by event-by-event fluctuations in the meson-baryon composition, rather than by the mean yields alone. Using the composition fluctuations obtained from UrQMD, we find that the minimum in the two-component calculation disappears.

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Cite

BibTeXRIS
BibTeX
@misc{manikandhan2026robustness,
  title = {{Robustness of the scaled transverse-momentum correlator and the contribution of meson--baryon fluctuations at RHIC energies}},
  author = {Rutik Manikandhan and Rene Bellwied},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.32790},
  eprint = {2610.32790},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.32790},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - UNPB
TI  - Robustness of the scaled transverse-momentum correlator and the contribution of meson--baryon fluctuations at RHIC energies
AU  - Rutik Manikandhan
AU  - Rene Bellwied
PY  - 2026
DA  - 2026/10/23
PB  - arXiv
DO  - 10.48550/arxiv.2610.32790
UR  - https://arxiv.org/abs/2610.32790
AB  - The search for the QCD critical point relies on identifying non-monotonic signatures in event-by-event fluctuation observables, such as the scaled two-particle transverse-momentum correlator C_p_T. Using a microscopic transport model (UrQMD), we establish the robustness of C_p_T against the variations that distinguish the datasets in the relevant collision energy regime, namely the choice of centrality estimator, finite tracking efficiency, and acceptance, including the difference between collider and fixed-target running. In addition, it has recently been proposed, based on UrQMD yields, that the measured non-monotonicity requires no critical dynamics and instead follows from the event-by-event composition of the final state. We show that this contribution is governed by event-by-event fluctuations in the meson-baryon composition, rather than by the mean yields alone. Using the composition fluctuations obtained from UrQMD, we find that the minimum in the two-component calculation disappears.
ER  -