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29 March 2024
 
  » arxiv » hep-ph/0301123

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Factorization and Sudakov Resummation in Leptonic Radiative B Decay
S.W. Bosch ; R.J. Hill ; B.O. Lange ; M. Neubert ;
Date 16 Dec 2002
Journal Phys.Rev. D67 (2003) 094014
Subject hep-ph
AffiliationCornell), R.J. Hill (SLAC), B.O. Lange (Cornell), M. Neubert (Cornell
AbstractSoft-collinear effective theory is used to prove factorization of the B->gamma+l+nu decay amplitude at leading power in Lambda/m_b, including a demonstration of the absence of non-valence Fock states and of the finiteness of the convolution integral in the factorization formula. Large logarithms entering the hard-scattering kernel are resummed by performing a two-step perturbative matching onto the low-energy effective theory, and by solving evolution equations derived from the renormalization properties of the leading-order B-meson light-cone distribution amplitude. As a byproduct, the evolution equation for heavy-collinear current operators in soft-collinear effective theory is derived.
Source arXiv, hep-ph/0301123
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