Power corrections to B̄ → Xu ℓ̄ν (X sγ) decay spectra in the "shape-function" region

Martin Beneke, Francisco Campanario, Thomas Mannel, Benjamin D. Pecjak

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


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.

Original languageEnglish
Pages (from-to)1635-1668
Number of pages34
JournalJournal of High Energy Physics
Issue number6
StatePublished - 1 Jun 2005
Externally publishedYes


  • B-Physics
  • Heavy Quarks Physics
  • QCD


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