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Title: Impact of resonance decays on critical point signals in net-proton fluctuations

Abstract

The non-monotonic beam energy dependence of the higher cumulants of net-proton fluctuations is a widely studied signature of the conjectured presence of a critical point in the QCD phase diagram. In this work we study the effect of resonance decays on critical fluctuations. We show that resonance effects reduce the signatures of critical fluctuations, but that for reasonable parameter choices critical effects in the net-proton cumulants survive. The relative role of resonance decays has a weak dependence on the order of the cumulants studied with a slightly stronger suppression of critical effects for higher-order cumulants.

Authors:
ORCiD logo [1];  [2];  [3];  [1]
  1. North Carolina State Univ., Raleigh, NC (United States). Dept. of Physics
  2. Univ. of Nantes (France). Ecole des Mines de Nantes. SUBATECH; Duke Univ., Durham, NC (United States). Dept. of Physics
  3. Duke Univ., Durham, NC (United States). Dept. of Physics
Publication Date:
Research Org.:
North Carolina State Univ., Raleigh, NC (United States); Duke Univ., Durham, NC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
Univ. of Nantes (France)
OSTI Identifier:
1349709
Alternate Identifier(s):
OSTI ID: 1361684
Grant/Contract Number:
FG02-03ER41260; FG02-05ER41367
Resource Type:
Journal Article: Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 77; Journal Issue: 4; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Bluhm, Marcus, Nahrgang, Marlene, Bass, Steffen A., and Schäfer, Thomas. Impact of resonance decays on critical point signals in net-proton fluctuations. United States: N. p., 2017. Web. doi:10.1140/epjc/s10052-017-4771-3.
Bluhm, Marcus, Nahrgang, Marlene, Bass, Steffen A., & Schäfer, Thomas. Impact of resonance decays on critical point signals in net-proton fluctuations. United States. doi:10.1140/epjc/s10052-017-4771-3.
Bluhm, Marcus, Nahrgang, Marlene, Bass, Steffen A., and Schäfer, Thomas. Mon . "Impact of resonance decays on critical point signals in net-proton fluctuations". United States. doi:10.1140/epjc/s10052-017-4771-3.
@article{osti_1349709,
title = {Impact of resonance decays on critical point signals in net-proton fluctuations},
author = {Bluhm, Marcus and Nahrgang, Marlene and Bass, Steffen A. and Schäfer, Thomas},
abstractNote = {The non-monotonic beam energy dependence of the higher cumulants of net-proton fluctuations is a widely studied signature of the conjectured presence of a critical point in the QCD phase diagram. In this work we study the effect of resonance decays on critical fluctuations. We show that resonance effects reduce the signatures of critical fluctuations, but that for reasonable parameter choices critical effects in the net-proton cumulants survive. The relative role of resonance decays has a weak dependence on the order of the cumulants studied with a slightly stronger suppression of critical effects for higher-order cumulants.},
doi = {10.1140/epjc/s10052-017-4771-3},
journal = {European Physical Journal. C, Particles and Fields},
number = 4,
volume = 77,
place = {United States},
year = {Mon Apr 03 00:00:00 EDT 2017},
month = {Mon Apr 03 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1140/epjc/s10052-017-4771-3

Citation Metrics:
Cited by: 5works
Citation information provided by
Web of Science

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  • The non-monotonic beam energy dependence of the higher cumulants of net-proton fluctuations is a widely studied signature of the conjectured presence of a critical point in the QCD phase diagram. In this work we study the effect of resonance decays on critical fluctuations. We show that resonance effects reduce the signatures of critical fluctuations, but that for reasonable parameter choices critical effects in the net-proton cumulants survive. The relative role of resonance decays has a weak dependence on the order of the cumulants studied with a slightly stronger suppression of critical effects for higher-order cumulants.
  • We investigate net proton fluctuations as important observables measured in heavy-ion collisions within the hadron resonance gas (HRG) model. Special emphasis is given to effects which are a priori not inherent in a thermally and chemically equilibrated HRG approach. In particular, we point out the importance of taking into account the successive regeneration and decay of resonances after the chemical freeze-out, which lead to a randomization of the isospin of nucleons and thus to additional fluctuations in the net proton number. In conclusion, we find good agreement between our model results and the recent STAR measurements of the higher-order momentsmore » of the net proton distribution.« less
  • Cited by 21
  • We calculate ratios of higher-order susceptibilities quantifying fluctuations in the number of net-protons and in the net-electric charge using the Hadron Resonance Gas (HRG) model. We take into account the effect of resonance decays, the kinematic acceptance cuts in rapidity, pseudo-rapidity and transverse momentum used in the experimental analysis, as well as a randomization of the isospin of nucleons in the hadronic phase. By comparing these results to the latest experimental data from the STAR Collaboration, we determine the freeze-out conditions from net-electric charge and net-proton distributions and discuss their consistency.
  • We calculate ratios of higher-order susceptibilities quantifying fluctuations in the number of net-protons and in the net-electric charge using the Hadron Resonance Gas (HRG) model. We take into account the effect of resonance decays, the kinematic acceptance cuts in rapidity, pseudo-rapidity and transverse momentum used in the experimental analysis, as well as a randomization of the isospin of nucleons in the hadronic phase. By comparing these results to the latest experimental data from the STAR Collaboration, we determine the freeze-out conditions from net-electric charge and net-proton distributions and discuss their consistency.