Towards the Anomalous Dimension to Order Lambda_QCD/m_b for Phase Space Restricted B --> X(u) ell anti-nu and B --> X(s) gamma

Abstract

We examine the anomalous dimension matrix appropriate for the phase space restricted B --> X(u) ell anti-nu and B --> X(s) gamma decay spectra to subleading nonperturbative order. The effects of the time ordered products of the HQET Lagrangian with the leading order shape function operator are calculated, as are the anomalous dimensions of subleading operators. We establish the renormalizability and closure of a subset of the non-local operator basis, a requirement for the establishment of factorization theorems at this order. Operator mixing is found between the operators which occur to subleading order, requiring the subleading operator basis be extended. We comment on the requirement for new shape functions to be introduced to characterize the matrix elements of these new operators, and the phenomenological consequences for extractions of $|V_{ub}|$.

23 pages, 3 figures V2- Minor Typos Fixed

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Cited by in corpus (7)

• Treating the b quark distribution function with reliable uncertainties
• Subleading Power Resummation of Rapidity Logarithms: The Energy-Energy Correlator in $\mathcal{N}=4$ SYM
• Helicity Methods for High Multiplicity Subleading Soft and Collinear Limits
• Subleading Jet Functions in Inclusive B Decays
• Jets in Effective Theory: Summing Phase Space Logs
• Nonperturbative m_X cut effects in B -> Xs l+ l- observables
• Subleading Shape-Function Effects and the Extraction of |V_ub|