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Based on the fact that the mass difference between the chiral partners is anorder parameter of chiral phase transition and that the chiral order parameterreduces substantially at the chemical freeze-out point in ultra-relativisticheavy ion collisions, we argue that the production ratio of $K_1$ over $K^*$ insuch collisions should be substantially larger than that predicted in thestatistical hadronization model. We further show that while the enhancementeffect might be contaminated by the relatively larger decrease of $K_1$ mesonthan $K^*$ meson during the hadronic phase, the signal will be visible througha systematic study on centrality as the kinetic freeze-out temperature ishigher and the hadronic life time shorter in peripheral collisions than incentral collisions.

$K_1/K^*$ enhancement as a signature of chiral symmetry restoration in heavy ion collisions