Factorization and Sudakov resummation in leptonic radiative B decay
Jan, 2003
21 pages
Published in:
- Phys.Rev.D 67 (2003) 094014
e-Print:
- hep-ph/0301123 [hep-ph]
Report number:
- SLAC-PUB-9625,
- CLNS-03-1817
View in:
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Abstract:
Soft-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.- 13.20.He
- 12.39.St
- 12.39.Hg
- 12.38.Cy
- B: leptonic decay
- B: radiative decay
- quantum chromodynamics
- factorization
- amplitude analysis
- Feynman graph: higher-order
References(29)
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