Understanding a QCD phase structure is one of the ultimate goals of heavy-ion collision experiments.
Recent publications from the STAR Collaboration show a non-monotonic energy dependence of fourth-order fluctuations of net-proton, which could indicate a possible signature of the critical point at $\sqrt{s_{\rm{NN}}}\approx 7.7$ GeV.
The sixth-order fluctuations of net-proton multiplicity distributions were reported to be negative for central Au+Au collisions at $\sqrt{s_{\rm{NN}}}~=~200~$GeV.
This could suggest a smooth crossover transition at top RHIC energy.
In this paper, we present the results of higher-order fluctuations of net-proton up to the sixth-order from $p$+$p$ collisions at $\sqrt{s}~=~200~$GeV.
It provides precise physics baselines to be compared to Au+Au collisions.
The positive signs of the fifth- and sixth-order fluctuations in $p$+$p$ collisions are observed and their multiplicity dependencies are found to connect smoothly to those from Au+Au collisions.
Volume 400 -
The International conference on Critical Point and Onset of Deconfinement (CPOD2021) -
session Wed3
Measurements of net-proton fluctuation for $p$+$p$ collisions at $√s$ = 200 GeV from the STAR experiment
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Pre-published on:
August 23, 2022
Published on:
September 01, 2022
Abstract
DOI: https://doi.org/10.22323/1.400.0030
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.