Power corrections to bar B→Xuℓbar nu (Xsγ) decay spectra in the ``shape-function'' region

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Published 28 June 2005 • Published under licence by IOP Publishing Ltd
, , Citation Martin Beneke et al JHEP06(2005)071 DOI 10.1088/1126-6708/2005/06/071

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Author affiliations

1 Institut für Theoretische Physik E, RWTH Aachen, D – 52056 Aachen, Germany

2 Institut für Theoretische Teilchenphysik, Universität Karlsruhe, D – 76128 Karlsruhe, Germany

3 Theoretische Physik 1, Fachbereich Physik, Universität Siegen, D – 57068 Siegen, Germany

Dates

  1. Received 7 December 2004
  2. Accepted 29 April 2005
  3. Published

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1126-6708/2005/06/071

Abstract

Using soft-collinear effective theory (SCET), we examine the 1/mb corrections to the factorization formulas for inclusive semi-leptonic B decays in the endpoint region, where the hadronic final state consists of a single jet. At tree level, we find a new contribution from four-quark operators that was previously assumed absent. Beyond tree level many sub-leading shape-functions are needed to correctly describe the decay process.

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10.1088/1126-6708/2005/06/071