Constraint equations for heavy-to-light currents in SCET

Details Constraint equations for heavy-to-light currents in SCET Constraint equations for heavy-to-light currents in SCET

2005-08-22

arxiv.org/abs/hep-ph/0508214v1

Phys.Rev. D72 (2005) 114002

Physics

High Energy Physics

High Energy Physics - Phenomenology

35 pages

Scientific paper

A complete basis for the next-to-next-to leading order heavy-to-light currents in the soft-collinear effective theory is constructed. Reparameterization invariance is imposed by deriving constraint equations. Their solutions give the set of allowed Dirac structures as well as relations between the Wilson coefficients of operators that appear at different orders in the power expansion. The completeness of reparameterization invariance constraints derived on a projected surface is investigated. We also discuss the universality of the ultrasoft Wilson line with boundary conditions.

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