$Υ$ absorption in hadronic matter

The cross sections of $Υ$ absorption by $π$ and $ρ$ mesons are evaluated in a meson-exchange model. Including form factors with a cutoff parameter of 1 or 2 GeV, we find that due to the large threshold of these reactions the thermal average of their cross sections is only about 0.2 mb at a temperature of 150 MeV. Our results thus suggest that the absorption of directly produced $Υ$ by hadronic comovers in high energy heavy ion collisions is unimportant.

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