Non-valence Fock states in heavy-to-light form factors at large recoil

Non-valence Fock states in heavy-to-light form factors at large recoil

AbstractWe studied three-particle Fock state contributions to heavy-to-light form factors in the context of soft-collinear effective theory and found that they enter at leading power. These contributions are non-factorizable due to the appearance of endpoint singularities, however they do not violat...

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Veröffentlicht in:The European physical journal. C, Particles and fields Particles and fields, 2004-07, Vol.33 (S1), p.s324-s326
1. Verfasser: Lange, Björn O.
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Sprache:eng
Schlagworte:
Fock state
Form factors
Mesons
Recoil
Singularities
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description AbstractWe studied three-particle Fock state contributions to heavy-to-light form factors in the context of soft-collinear effective theory and found that they enter at leading power. These contributions are non-factorizable due to the appearance of endpoint singularities, however they do not violate spin-symmetry relations at leading power. In this talk I present their numerical estimation in a crude model in which the “soft overlap” contribution is cut off and find that they might lower the standard values for the form factors at maximum recoil significantly. Furthermore I briefly discuss the role of soft-collinear messenger modes in the region of soft overlap.PACS: 12.39.St Factorization – 13.20.He Decays of bottom mesons
doi_str_mv 10.1140/epjcd/s2003-03-219-9
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subjects Fock state
Form factors
Mesons
Recoil
Singularities
title Non-valence Fock states in heavy-to-light form factors at large recoil
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