Phase Space and Dynamical Fluctuations of Kaon-to-Pion Ratios

The dynamical fluctuations of kaon-to-pion ratios have been studied over a wide range of center-of-mass energies root s. On the basis of changing phase space volume which apparently is the consequence of phase transition from hadrons to quark-gluon plasma at large root s, the single-particle distribution function f is assumed to be rather modified. Varying f and phase space volume are implemented in the grand-canonical partition function, especially at large root s, so that the hadron resonance gas model, when taking into account the experimental acceptance and quark phase space occupation factor, turns to be able to reproduce the dynamical fluctuations of kaon-to-pion ratios over the entire range of root s.