QCD sum-rule calculations find kaon masses decrease monotonically with baryon density and temperature, developing a splitting of up to 0.35 GeV between K+ and K- at high density due to the Weinberg-Tomozawa term.
Adamet al.[STAR], ”Beam energy dependence of net-Λfluctuations measured by the STAR experiment at the BNL Relativistic Heavy Ion Collider”, Phys
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Kaons in hot and dense QCD
QCD sum-rule calculations find kaon masses decrease monotonically with baryon density and temperature, developing a splitting of up to 0.35 GeV between K+ and K- at high density due to the Weinberg-Tomozawa term.