Power corrections to B\to X_u l ν(X_sγ) decay spectra in the "shape-function" region

Details Power corrections to B\to X_u l ν(X_sγ) decay spectra in the "shape-function" region Power corrections to B\to X_u l ν(X_sγ) decay spectra in the "shape-function" region

2004-11-30

arxiv.org/abs/hep-ph/0411395v2

JHEP 0506:071,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

34 pages, v2: journal version

Scientific paper

10.1088/1126-6708/2005/06/071

Using soft-collinear effective theory (SCET), we examine the 1/m_b 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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