Sudakov resummation for subleading SCET currents and heavy-to-fight form factors

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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.
Publisher
INT SCHOOL ADVANCED STUDIES
Issue Date
2004-07
Language
English
Article Type
Article
Citation

JOURNAL OF HIGH ENERGY PHYSICS

ISSN
1126-6708
DOI
10.1088/1126-6708/2004/07/081
URI
http://hdl.handle.net/10203/82747
Appears in Collection
PH-Journal Papers(저널논문)
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