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Title: Curvature of the freeze-out line in heavy ion collisions

Here, we calculate the mean and variance of net-baryon number and net-electric charge distributions from quantum chromodynamics (QCD) using a next-to-leading order Taylor expansion in terms of temperature and chemical potentials. Moreover, these expansions with experimental data from STAR and PHENIX are compared, we determine the freeze-out temperature in the limit of vanishing baryon chemical potential, and, for the first time, constrain the curvature of the freeze-out line through a direct comparison between experimental data on net-charge fluctuations and a QCD calculation. We obtain a bound on the curvature coefficient, κ$^f$$_2$<0.011, that is compatible with lattice QCD results on the curvature of the QCD transition line.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [3] ;  [5] ;  [6] ;  [5] ;  [3] ;  [5] ;  [7] ;  [8]
  1. Univ. of Iowa, Iowa City, IA (United States)
  2. Central China Normal Univ., Wuhan (China)
  3. Univ. of Bielefeld (Germany)
  4. Univ. of Bielefeld (Germany); Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Tsukuba (Japan)
  7. Univ. of Regensburg (Germany)
  8. Indiana Univ., Bloomington, IN (United States)
Publication Date:
OSTI Identifier:
1254818
Report Number(s):
BNL--112232-2016-JA
Journal ID: ISSN 2470-0010; PRVDAQ; KB0301020
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal Issue: 1; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS lattice; LAT; QCD; Taylor; STAR; baryon; PHENIX