Prof. dr hab. David Blaschke (IFT)

Mott dissociation of pions and kaons in hot, dense quark matter

The Beth-Uhlenbeck approach to the description of meson bound state formation and dissociation in hot dense quark matter is generalized to the case of 2+1 flavors on the basis of the PNJL model. One unexpected finding is the appearance of an anomalous K+ bound state in medium which appears as a good candidate for explaining the "horn" effect for the K+/pi+ ratio as observed in the energy scan by the NA49 experiment and confirmed by STAR.