Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-10-17
Phys.Rev.D74:034011,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 3 figures V2- Minor Typos Fixed
Scientific paper
10.1103/PhysRevD.74.034011
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 $|V_{ub}|$.
Trott Michael
Williamson Alexander R.
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