Freezeout systematics due to the hadron spectrum

Sandeep Chatterjee, Debadeepti Mishra, Bedangadas Mohanty, and Subhasis Samanta
Phys. Rev. C 96, 054907 – Published 15 November 2017

Abstract

We investigate systematics of the freezeout surface in heavy ion collisions due to the hadron spectrum. The role of suspected resonance states that are yet to be confirmed experimentally in identifying the freezeout surface has been investigated. We have studied two different freezeout schemes: a unified freezeout scheme where all hadrons are assumed to freeze out at the same thermal state and a flavor-dependent sequential freezeout scheme with different freezeout thermal states for hadrons with or without valence strange quarks. The data of mean hadron yields as well as scaled variance of net proton and net charge distributions have been analyzed. We find the freezeout temperature T to drop by 5% while the dimensionless freezeout parameters μB/T and VT3 (μB and V are the baryon chemical potential and the volume at freezeout respectively) are insensitive to the systematics of the input hadron spectrum. The observed hint of flavor hierarchy in T and VT3 with only confirmed resonances survives the systematics of the hadron spectrum. It is more prominent in the range sNN10100 GeV, where the maximum hierarchy in T is 10% and in VT3 is 40%. However, the uncertainties in the thermal parameters due to the systematics of the hadron spectrum and their decay properties do not allow us to make a quantitative estimate of the flavor hierarchy yet.

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  • Received 14 September 2017

DOI:https://doi.org/10.1103/PhysRevC.96.054907

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Sandeep Chatterjee*

  • AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, al. Mickiewicza 30, 30-059 Krakow, Poland

Debadeepti Mishra, Bedangadas Mohanty, and Subhasis Samanta§

  • School of Physical Sciences, National Institute of Science Education and Research, HBNI, Jatni 752050, India

  • *Sandeep.Chatterjee@fis.agh.edu.pl
  • debadeepti.m@niser.ac.in
  • bedanga@niser.ac.in
  • §subhasis@niser.ac.in

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Issue

Vol. 96, Iss. 5 — November 2017

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