UrQMD study of the effects of centrality definitions on higher moments of net protons at energies available at the BNL Relativistic Heavy Ion Collider

Gary D. Westfall
Phys. Rev. C 92, 024902 – Published 4 August 2015

Abstract

A study using UrQMD is presented concerning the higher moments of net protons from Au + Au collisions at 7.7, 11.5, 14.6, 19.6, 27, 39, 62.4, and 200 GeV, concentrating on C4/C2=κσ2. Higher moments of net protons are predicted to be a sensitive probe of the critical point of QCD. At the QCD critical point, particular ratios of the moments of net protons are predicted to differ from the Poisson baseline. Recently the STAR Collaboration has published the higher moments of net protons for Au + Au collisions at sNN=7.7, 11.5, 19.6, 27, 39, 62.4, and 200 GeV. UrQMD quantitatively reproduces STAR's measured C4/C2=κσ2 for net protons for all Au + Au collisions more central than 30% and at all centralities for sNN=7.7 and 11.5 GeV. The effects are investigated of three different centrality definitions on the values of C4/C2=κσ2 from UrQMD calculations including the impact parameter given by UrQMD. It is shown that using a centrality definition based on multiplicity to calculate the higher moments of net protons gives a biased answer for C4/C2=κσ2, except in the most central bin (0–5%).

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  • Received 17 December 2014

DOI:https://doi.org/10.1103/PhysRevC.92.024902

©2015 American Physical Society

Authors & Affiliations

Gary D. Westfall

  • National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA

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Issue

Vol. 92, Iss. 2 — August 2015

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