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.
Adamczewski-Muschet al.[HADES], ”Strong absorption of hadrons with hidden and open strangeness in nuclear matter”, 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.