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- W3083646489 abstract "Abstract Within the three-flavor PNJL and EPNJL chiral quark models we have obtained pseudoscalar meson properties in quark matter at finite temperature T and baryochemical potential μ B . We compare the meson pole (Breit-Wigner) approximation with the Beth-Uhlenbeck (BU) approach that takes into account the continuum of quark-antiquark scattering states when determining the partial densities of pions and kaons. We evaluate the kaon-to-pion ratios along the (pseudo-)critical line in the T − μ B plane as a proxy for the chemical freezeout line, whereby the variable x = T ∕ μ B is introduced that corresponds to the conserved entropy per baryon as initial condition for the heavy-ion collision experiments. We present a comparison with the experimental pattern of kaon-to-pion ratios within the BU approach and using x -dependent pion and strange quark potentials. A sharp “horn” effect in the energy dependence K + ∕ π + ratio is explained by the enhanced pion production at energies above √ s NN =8 GeV, when the system enters the regime of meson dominance. This effect is in line with the enhancement of low-momentum pion spectra that is discussed as a precursor of the pion Bose condensation and entails the occurrence of a nonequilibrium pion chemical potential of the order of the pion mass. We elucidate that the horn effect is not related to the existence of a critical endpoint in the QCD phase diagram." @default.
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- W3083646489 date "2020-12-01" @default.
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- W3083646489 title "Chiral phase transition and kaon-to-pion ratios in the entanglement SU(3) PNJL model" @default.
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- W3083646489 doi "https://doi.org/10.1140/epjst/e2020-000218-1" @default.
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