$\Upsilon$ absorption in hadronic matter

C. M. Ko; Ziwei Lin

$\Upsilon$ absorption in hadronic matter

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arxiv nucl-th/0007027 v2 pith:E7BGR44F submitted 2000-07-12 nucl-th

Ziwei Lin , C. M. Ko This is my paper

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keywords absorptionupsiloncrosshadronicsectionsaveragecollisionscomovers

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abstract

The cross sections of $\Upsilon$ absorption by $\pi$ and $\rho$ 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 $\Upsilon$ by hadronic comovers in high energy heavy ion collisions is unimportant.

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