Repulsive baryonic interactions and lattice QCD observables at imaginary chemical potential

The first principle lattice QCD methods allow to calculate the thermodynamic observables at finite temperature and imaginary chemical potential. These can be compared to the predictions of various phenomenological models
The first principle lattice QCD methods allow to calculate the thermodynamic observables at finite temperature and imaginary chemical potential. These can be compared to the predictions of various phenomenological models. We argue that Fourier coefficients with respect to imaginary baryochemical potential are sensitive to modeling of baryonic interactions. As a first application of this sensitivity, we consider the hadron resonance gas (HRG) model with repulsive baryonic interactions, which are modeled by means of the excluded volume correction. The Fourier coefficients of the imaginary part of the netbaryon density at imaginary baryochemical potential – corresponding to the fugacity or virial expansion at real chemical potential – are calculated within this model, and compared with the Nt = 12 lattice data. The lattice QCD behavior of the first four Fourier coefficients up to T  185 MeV is described fairly well by an interacting HRG with a single baryon–baryon eigenvolume interaction parameter b  1 fm3, while the available lattice data on the difference χB 2 − χB 4 of baryon number susceptibilities is reproduced up to T  175 MeV.
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Metadaten
Author:Volodymyr Vovchenko, Attila Pásztor, Zoltán Fodor, Sandor D. Katzeg, Horst Stöcker
URN:urn:nbn:de:hebis:30:3-547881
DOI:http://dx.doi.org/10.1016/j.physletb.2017.10.042
ISSN:1873-2445
ISSN:0370-2693
Parent Title (English):Physics Letters B
Publisher:Elsevier
Place of publication:Amsterdam [u.a.]
Document Type:Article
Language:English
Year of Completion:2017
Year of first Publication:2017
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2020/05/14
Tag:Excluded volume; Hadron resonance gas; Imaginary chemical potential
Volume:775.2017
Pagenumber:8
First Page:71
Last Page:78
HeBIS PPN:465586570
Institutes:Physik
Dewey Decimal Classification:530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 4.0

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