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Ultrasoft contribution to quarkonium production and annihilation

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 نشر من قبل Martin Beneke
 تاريخ النشر 2007
  مجال البحث
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 تأليف M. Beneke




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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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