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Heavy quarkonium in a weakly-coupled quark-gluon plasma below the melting temperature

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We calculate the heavy quarkonium energy levels and decay widths in a quark-gluon plasma, whose temperature T and screening mass m D satisfy the hierarchy mα s ≫ T ≫ mα s 2 ≫m D (m being the heavy-quark mass), at order mα s 5 . We first sequentially integrate out the scales m, mα s and T, and, next, we carry out the calculations in the resulting effective theory using techniques of integration by regions. A collinear region is identified, which contributes at this order. We also discuss the implications of our results concerning heavy quarkonium suppression in heavy ion collisions.

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Journal of High Energy Physics, 2010, vol. 2010, num. 038

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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Heavy quarkonium in a weakly-coupled quark-gluon plasma below the melting temperature