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Title: Effect of the QCD equation of state and strange hadronic resonances on multiparticle correlations in heavy ion collisions

Journal Article · · Physical Review C
 [1];  [2];  [3]; ORCiD logo [4];  [5];  [5];  [5]
  1. Goethe Univ., Frankfurt (Germany)
  2. Technische Univ., Munich (Germany)
  3. Univ. of Sao Paulo (Brazil)
  4. Rutgers Univ., Piscataway, NJ (United States)
  5. Univ. of Houston, TX (United States)

The QCD equation of state at zero baryon chemical potential is the only element of the standard dynamical framework to describe heavy ion collisions that can be directly determined from first principles. Continuum extrapolated lattice QCD equations of state have been computed using 2+1 quark flavors (up/down and strange) as well as 2+1+1 flavors to investigate the effect of thermalized charm quarks on QCD thermodynamics. Lattice results have also indicated the presence of new strange resonances that not only contribute to the equation of state of QCD matter but also affect hadronic afterburners used to model the later stages of heavy ion collisions. We investigate how these new developments obtained from first principles calculations affect multiparticle correlations in heavy ion collisions. We compare the commonly used equation of state S95n-v1, which was constructed using what are now considered outdated lattice results and hadron states, to the current state-of-the-art lattice QCD equations of state with 2+1 and 2+1+1 flavors coupled to the most upto-date hadronic resonances and their decays. New hadronic resonances lead to an enhancement in the hadronic spectra at intermediate pT . Using an outdated equation of state can directly affect the extraction of the shear viscosity to entropy density ratio, η/s, of the quark-gluon plasma and results for different flow observables. The effects of the QCD equation of state on multiparticle correlations of identified particles are determined for both AuAu √ sNN = 200 GeV and PbPb √ sNN = 5.02 TeV collisions. New insights into the v2{2} to v3{2} puzzle in ultracentral collisions are found. Flow observables of heavier particles exhibit more non-linear behavior regardless of the assumptions about the equation of state, which may provide a new way to constrain the temperature dependence of η/s.

Research Organization:
Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); National Science Foundation (NSF)
Award DOI(s):
https://doi.org/SC0019175
Awarding Organization: DOE

Grant/Contract Number:
SC0020633; SC0019175
OSTI ID:
1836812
Journal Information:
Physical Review C, Vol. 98, Issue 3; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

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Cited By (3)

Freeze-out conditions from strangeness observables at RHIC journal February 2019
Lattice-based equation of state at finite baryon number, electric charge and strangeness chemical potentials text January 2019
Fast resonance decays in nuclear collisions journal March 2019