Sudakov Resummation for Subleading SCET Currents and Heavy-to-Light Form Factors

Details Sudakov Resummation for Subleading SCET Currents and Heavy-to-Light Form Factors Sudakov Resummation for Subleading SCET Currents and Heavy-to-Light Form Factors

2004-04-23

arxiv.org/abs/hep-ph/0404217v2

JHEP0407:081,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

50 pages, 10 figures; minor corrections, version to appear in JHEP

Scientific paper

10.1088/1126-6708/2004/07/081

The hard-scattering contributions to heavy-to-light form factors at large recoil are studied systematically in soft-collinear effective theory (SCET). Large logarithms arising from multiple energy scales are resummed by matching QCD onto SCET in two stages via an intermediate effective theory. Anomalous dimensions in the intermediate theory are computed, and their form is shown to be constrained by conformal symmetry. Renormalization-group evolution equations are solved to give a complete leading-order analysis of the hard-scattering contributions, in which all single and double logarithms are resummed. In two cases, spin-symmetry relations for the soft-overlap contributions to form factors are shown not to be broken at any order in perturbation theory by hard-scattering corrections. One-loop matching calculations in the two effective theories are performed in sample cases, for which the relative importance of renormalization-group evolution and matching corrections is investigated. The asymptotic behavior of Sudakov logarithms appearing in the coefficient functions of the soft-overlap and hard-scattering contributions to form factors is analyzed.

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