Evolution of charm-meson ratio in an expanding hadron gas

Kevon Ingles (Ohio State University)

Abstract: We study the time evolution of the number of charm mesons after the kinetic freeze-out of the hadron gas produced by a central heavy-ion collision. The π D* → π D* reaction rates have t-channel singularities that give contributions inversely proportional to the thermal width of the D. The ratio of the D0 and D+ production rate can differ significantly from those predicted using the measured D* branching fractions.

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