Electroweak Absorptive Parts in NRQCD Matching Conditions

Details Electroweak Absorptive Parts in NRQCD Matching Conditions Electroweak Absorptive Parts in NRQCD Matching Conditions

2004-12-17

arxiv.org/abs/hep-ph/0412258v2

Phys.Rev. D71 (2005) 074022

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, revtex4, 4 postscript figures included; minor changes in text and references, title modified in printed version

Scientific paper

10.1103/PhysRevD.71.074022

Electroweak corrections associated with the instability of the top quark to the next-to-next-to-leading logarithmic (NNLL) total top pair threshold cross section in e+e- annihilation are determined. Our method is based on absorptive parts in electroweak matching conditions of the NRQCD operators and the optical theorem. The corrections lead to ultraviolet phase space divergences that have to be renormalized and lead to NLL mixing effects. Numerically, the corrections can amount to several percent and are comparable to the known NNLL QCD corrections.

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