{"arxiv_id":"hep-ph/0411395","title":"Power corrections to B\\to X_u l \\nu (X_s\\gamma) decay spectra in the \"shape-function\" region","abstract":"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.","primary_cat":"hep-ph","cross_cats":[],"submitted_at":"2004-11-30T11:31:30+00:00","latest_version":2,"source":"arxiv","source_label":"arXiv","source_url":null,"has_pdf":true,"has_source":false,"verdict":"CONDITIONAL","confidence":"HIGH","one_line_summary":"A complete tree-level SCET calculation of 1/m_b corrections to inclusive B to X_u l nu and B to X_s gamma spectra reveals a previously missed four-quark shape-function contribution.","novelty_score":6.0,"correctness_risk":"medium","formal_verification":"none","upvotes":0,"downvotes":0,"pith_score":0,"inbound_count":23,"_links":{"html":"https://pith.science/paper/hep-ph/0411395","verdict":"/api/v1/verdicts/hep-ph/0411395"}}