TY  - JOUR
A1  - Vovchenko, Volodymyr
A1  - Pásztor, Attila
A1  - Fodor, Zoltán
A1  - Katzeg, Sandor D.
A1  - Stöcker, Horst
T1  - Repulsive baryonic interactions and lattice QCD observables at imaginary chemical potential
T2  - Physics Letters B
N2  - 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.
KW  - Hadron resonance gas
KW  - Excluded volume
KW  - Imaginary chemical potential
Y1  - 2017
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/54788
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-547881
SN  - 1873-2445
SN  - 0370-2693
VL  - 775.2017
SP  - 71
EP  - 78
PB  - Elsevier
CY  - Amsterdam [u.a.]
ER  -