Speaker
Description
Based on the fact that the mass difference between the chiral
partners is an order parameter of chiral phase transition and that
the chiral order parameter reduces substantially at the chemical
freeze-out point in ultra-relativistic heavy ion collisions, we
argue that the production ratio of $K_1$ over $K^*$ in such
collisions should be substantially larger than that predicted in
the statistical hadronization model. We further show that while
the enhancement effect might be contaminated by the relatively
larger decrease of $K_1$ meson than $K^*$ meson during the
hadronic phase, the signal will be visible through a systematic
study on centrality as the kinetic freeze-out temperature is
higher and the hadronic life time shorter in peripheral collisions
than in central collisions.
