The B -> pi Form Factor from Light-cone Sum Rules in Soft-collinear Effective Theory

Hurth, Tobias ; /SLAC, /CERN ; De Fazio, Fulvia ; /INFN, Bari ; Feldmann, Thorsten ; U., /Siegen

Stanford Linear Accelerator Center

关键词: Form Factors;    Amplitudes;    Factorization;    Sum Rules Phenomenology-Hep,Hepex, Hepph, Hepth;    Correlation Functions;   

DOI  :  10.2172/878084
RP-ID  :  SLAC-PUB-11484
RP-ID  :  AC02-76SF00515
RP-ID  :  878084

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来源: UNT Digital Library

【 摘 要 】

Recently, we have derived light-cone sum rules for exclusive B-meson decays into light energetic hadrons from correlation functions within soft-collinear effective theory [1]. In these sum rules the short-distance scale refers to ''hard-collinear'' interactions with virtualities of order {Lambda}{sub QCD}m{sub b}. Hard scales (related to virtualities of order m{sub b}{sup 2}) are integrated out and enter via external coefficient functions in the sum rule. Soft dynamics is encoded in light-cone distribution amplitudes for the B-meson, which describe both the factorizable and non-factorizable contributions to exclusive B-meson decay amplitudes. Factorization of the correlation function has been verified to one-loop accuracy. Thus, a systematic separation of hard, hard-collinear, and soft dynamics in the heavy-quark limit is possible.