Ultrasoft contribution to quarkonium production and annihilation
نویسنده
چکیده
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 Υ(1S) leptonic width and the top quark-antiquark threshold production cross section is estimated. PACS numbers: 12.38.Bx, 14.40.Gx, 14.65.Fy, 14.65.Ha
منابع مشابه
Ultrasoft contribution to heavy-quark pair production near threshold
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