Ultrasoft contribution to quarkonium production and annihilation

Details Ultrasoft contribution to quarkonium production and annihilation Ultrasoft contribution to quarkonium production and annihilation

2007-06-19

arxiv.org/abs/0706.2733v1

Phys.Lett.B653:53-59,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages

Scientific paper

10.1016/j.physletb.2007.06.068

We compute the third-order correction to electromagnetic S-wave quarkonium production and annihilation rates due to the emission and absorption of an ultrasoft gluon. Our result completes the analysis of the non-relativistic quarkonium bound-state dynamics in the next-to-next-to-next-to-leading order. The impact of the ultrasoft correction on the Upsilon(1S) leptonic width and the top quark-antiquark threshold production cross section is estimated.

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