Application of heavy-quark effective theory to lattice QCD: II.
Radiative corrections to heavy-light currents
release_chzie6rlzjf33mqjupaon3a7ry
by
Junpei Harada, Shoji Hashimoto, Ken-Ichi Ishikawa, Andreas S.
Kronfeld, Tetsuya Onogi, Norikazu Yamada
2001
Abstract
We apply heavy-quark effective theory to separate long- and short-distance
effects of heavy quarks in lattice gauge theory. In this approach, the inverse
heavy-quark mass and the lattice spacing are treated as short distances, and
their effects are lumped into short-distance coefficients. We show how to use
this formalism to match lattice gauge theory to continuum QCD, order by order
in the heavy-quark expansion. In this paper, we focus on heavy-light currents.
In particular, we obtain one-loop results for the matching factors of lattice
currents, needed for heavy-quark phenomenology, such as the calculation of
heavy-light decay constants, and heavy-to-light transition form factors.
Results for the Brodsky-Lepage-Mackenzie scale q^* are also given.
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