Two-Loop Matching Coefficients for Heavy Quark Currents
arXiv:hep-ph/0604072 · doi:10.1016/j.physletb.2006.05.023
Abstract
In this paper we consider the matching coefficients up to two loops between Quantum Chromodynamics (QCD) and Non-Relativistic QCD (NRQCD) for the vector, axial-vector, scalar and pseudo-scalar currents. The structure of the effective theory is discussed and analytical results are presented. Particular emphasis is put on the singlet diagrams.
9 pages
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