Measurement of the Sixth-Order Cumulant of Net-Proton Multiplicity 
Distributions in Au+Au Collisions at sqrt{s_NN} = 27, 54.4, and 200 GeV at RHIC

STAR Collaboration,; Adam, J.; Schmitz, N.; Seyboth, P.; et al.,

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Measurement of the Sixth-Order Cumulant of Net-Proton Multiplicity Distributions in Au+Au Collisions at sqrt{s_NN} = 27, 54.4, and 200 GeV at RHIC

MPS-Authors

STAR Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Adam, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schmitz, N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Seyboth, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al.,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

STAR Collaboration, Adam, J., Schmitz, N., Seyboth, P., & et al. (2021). Measurement of the Sixth-Order Cumulant of Net-Proton Multiplicity Distributions in Au+Au Collisions at sqrt{s_NN} = 27, 54.4, and 200 GeV at RHIC. Physical Review Letters, 127, 262301. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2021-256.

Cite as: https://hdl.handle.net/21.11116/0000-000A-1B8A-D

Abstract

We report the first measurement of the midrapidity net-proton C6/C2 from 27, 54.4 and 200 GeV Au+Au collisions at RHIC. The dependence on collision centrality and kinematic acceptance in (pT, y) are analyzed. While for 27 and 54.4 GeV collisions the C6/C2 values are close to zero within uncertainties, it is observed that for 200 GeV collisions, the C6/C2 ratio becomes progressively negative from peripheral to central collisions. Transport model calculations without critical dynamics predict mostly positive values except for the most central collisions within uncertainties. These observations seem to favor a smooth crossover in the high energy nuclear collisions at top RHIC energy.