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Spectator interactions and factorization in B -> pi ell nu decay | | M.Beneke
; Th.Feldmann
; | | Date: |
28 Aug 2003 | | Journal: | Eur.Phys.J. C33 (2004) S241-S243 | | Subject: | hep-ph | | Affiliation: | RWTH Aachen, Germany), Th.Feldmann (CERN, Geneva, Switzerland | | Abstract: | We investigate the factorization of different momentum modes that appear in matrix elements for exclusive B meson decays into light energetic particles for the specific case of B -> pi form factors at large pion recoil. We first integrate out hard modes with virtualities of order m_b^2 (m_b being the heavy quark mass), and then hard-collinear modes with virtualities m_b Lambda (Lambda being the strong interaction scale). The resulting effective theory contains soft and collinear fields with virtualities Lambda^2. We prove a previously conjectured factorization formula for B -> pi form factors in the heavy quark limit to all orders in alpha_s, paying particular attention to `endpoint singularities’ that might have appeared in hard spectator interactions. | | Source: | arXiv, hep-ph/0308303 | | Services: | Forum | Review | PDF | Favorites | |
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