SCET Sum Rules for B to P and B to V Transition Form Factors

[摘要] We investigate sum rules for heavy-to-light transition form factors at large recoil derived from correlation functions with interpolating currents for light pseudoscalar or vector fields in soft-collinear effective theory (SCET). We consider both, factorizable and nonfactorizable contributions at leading power in the {Lambda}/m{sub b} expansion and to first order in the strong coupling constant {alpha}{sub s}, neglecting contributions from 3-particle distribution amplitudes in the B-meson. We pay particular attention to various sources of parametric and systematic uncertainties. We also discuss certain form factor ratios where part of the hadronic uncertainties related to the B-meson distribution amplitude and to logarithmically enhanced {alpha}{sub s} corrections cancel.

[发布日期] 2007-12-18

[学科分类] 物理（综合）

[关键词] B MESONS;CORRELATION FUNCTIONS;COUPLING CONSTANTS;FORM FACTORS;PSEUDOSCALARS;SUM RULES;VECTOR FIELDS;DATA COVARIANCES Phenomenology-HEP;HEPEX;HEPPH;HEPTH