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.
Acharyaet al.[NA61/SHINE], ”Measurements of𝜋 ±,𝐾 ±,𝑝and ¯𝑝spectra in 7Be+9Be collisions at beam momenta from 19𝐴to 150𝐴 GeV/𝑐with the NA61/SHINE spectrometer at the CERN SPS”, Eur
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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.