QCD bulk thermodynamics and conserved charge fluctuations with HISQ fermions

Schmidt C (2013)
Journal of Physics: Conference Series 432: 012013.

Konferenzbeitrag | Veröffentlicht | Englisch
 
Download
OA 1.36 MB
Abstract / Bemerkung
After briefly reviewing recent progress by the HotQCD collaboration in studying the 2+1 flavor QCD equation of state, we will focus on results on fluctuations of conserved charges by the BNL-Bielefeld and HotQCD collaborations. Higher order cumulants of the net-charge distributions are increasingly dominated by a universal scaling behavior, which arises due to a critical point of QCD in the chiral limit. Considering cumulants up to the 6^{th} order, we observe that they generically behave as expected from universal scaling laws, which is quite different from cumulants calculated within the hadron resonance gas model. Taking ratios of these cumulants, we obtain volume independent results that can be compared to the experimental measurements. We will argue that the freeze-out chemical potentials and the freeze-out temperature, usually obtained by a HRG model fit to the measured hadronic yields, can also be obtained in a model independent way from ab-initio lattice QCD calculations by utilizing observables related to conserved charge fluctuations. Further, we will show that the freeze-out strangeness and electric charge chemical potentials can be fixed by imposing strangeness neutrality and isospin asymmetry constraints in the lattice QCD calculations, in order to accommodate conditions met in heavy ion collisions. All results have been obtained with the highly improved staggered quark action (HISQ) and almost physical quark masses on lattices with temporal extent of N_\tau=6,8,10,12. After briefly reviewing recent progress by the HotQCD collaboration in studying the 2+1 flavor QCD equation of state, we will focus on results on fluctuations of conserved charges by the BNL-Bielefeld and HotQCD collaborations. Higher order cumulants of the net-charge distributions are increasingly dominated by a universal scaling behavior, which arises due to a critical point of QCD in the chiral limit. Considering cumulants up to the 6(th) order, we observe that they generically behave as expected from universal scaling laws, which is quite different from cumulants calculated within the hadron resonance gas model. Taking ratios of these cumulants, we obtain volume independent results that can be compared to the experimental measurements. We will argue that the freeze-out chemical potentials and the freeze-out temperature, usually obtained by a HRG model fit to the measured hadronic yields, can also be obtained in a model independent way from ab-initio lattice QCD calculations by utilizing observables related to conserved charge fluctuations. Further, we will show that the freeze-out strangeness and electric charge chemical potentials can be fixed by imposing strangeness neutrality and isospin asymmetry constraints in the lattice QCD calculations, in order to accommodate conditions met in heavy ion collisions. All results have been obtained with the highly improved staggered quark action (HISQ) and almost physical quark masses on lattices with temporal extent of N(τ) = 6, 8, 10, 12.
Erscheinungsjahr
2013
Serien- oder Zeitschriftentitel
Journal of Physics: Conference Series
Band
432
Art.-Nr.
012013
Konferenz
Extreme QCD 2012 (xQCD)
Konferenzort
Washington DC, USA
Konferenzdatum
2012-08-21 – 2012-08-23
ISSN
1742-6588
Page URI
https://pub.uni-bielefeld.de/record/2606325

Zitieren

Schmidt C. QCD bulk thermodynamics and conserved charge fluctuations with HISQ fermions. Journal of Physics: Conference Series. 2013;432: 012013.
Schmidt, C. (2013). QCD bulk thermodynamics and conserved charge fluctuations with HISQ fermions. Journal of Physics: Conference Series, 432, 012013. https://doi.org/10.1088/1742-6596/432/1/012013
Schmidt, Christian. 2013. “QCD bulk thermodynamics and conserved charge fluctuations with HISQ fermions”, Journal of Physics: Conference Series, 432: 012013.
Schmidt, C. (2013). QCD bulk thermodynamics and conserved charge fluctuations with HISQ fermions. Journal of Physics: Conference Series 432:012013.
Schmidt, C., 2013. QCD bulk thermodynamics and conserved charge fluctuations with HISQ fermions. Journal of Physics: Conference Series, 432: 012013.
C. Schmidt, “QCD bulk thermodynamics and conserved charge fluctuations with HISQ fermions”, Journal of Physics: Conference Series, vol. 432, 2013, : 012013.
Schmidt, C.: QCD bulk thermodynamics and conserved charge fluctuations with HISQ fermions. Journal of Physics: Conference Series. 432, : 012013 (2013).
Schmidt, Christian. “QCD bulk thermodynamics and conserved charge fluctuations with HISQ fermions”. Journal of Physics: Conference Series 432 (2013): 012013.
Alle Dateien verfügbar unter der/den folgenden Lizenz(en):
Copyright Statement:
Dieses Objekt ist durch das Urheberrecht und/oder verwandte Schutzrechte geschützt. [...]
Volltext(e)
Access Level
OA Open Access
Zuletzt Hochgeladen
2022-05-03T13:33:21Z
MD5 Prüfsumme
69c75235e0356734c8990eedf760fdca


Link(s) zu Volltext(en)
Access Level
OA Open Access

Export

Markieren/ Markierung löschen
Markierte Publikationen

Open Data PUB

Web of Science

Dieser Datensatz im Web of Science®
Quellen

arXiv: 1212.4283

Inspire: 1207890

Suchen in

Google Scholar