HQET chromomagnetic interaction at two loops
High Energy Physics - Phenomenology
2008-11-26 v3
Abstract
We present the coefficient of the chromomagnetic interaction operator, the only unknown coefficient in the Heavy Quark Effective Theory (HQET) lagrangian up to the level, with the two-loop accuracy by matching scattering amplitudes of an on-shell heavy quark in an external field in full QCD and HQET, and obtain the two-loop anomalous dimension of this operator in HQET.
Cite
@article{arxiv.hep-ph/9701415,
title = {HQET chromomagnetic interaction at two loops},
author = {A. Czarnecki and A. G. Grozin},
journal= {arXiv preprint arXiv:hep-ph/9701415},
year = {2008}
}
Comments
10 pages, LaTeX2e, 2 eps figures included. Revised discussion of (n_f-1)-flavour HQET included