Repository logo
 

Progress in computing inclusive B decay spectra.


Type

Article

Change log

Authors

Gardi, Einan 
Andersen, Jeppe R 

Abstract

We review the progress in the QCD calculation of inclusive decay spectra. It was recently shown that the inherent infrared finiteness of inclusive spectra extends beyond the level of logarithms. Dressed Gluon Exponentiation makes practical use of this property by computing the Sudakov exponent as a Borel sum. Based on renormalon analysis, infrared sensitivity in the exponent is reflected in power corrections that are inversely proportional to the third power of the mass. Therefore, the parametric enhancement of non-perturbative corrections near the phase–space boundary is effective only in a small region. Consequently, the on-shell decay spectrum provides a good approximation to the meson decay. In particular, it facilitates a precise determination of |Vub| from present measurements of inclusive charmless semileptonic widths without involving a non-perturbative “shape function”.

Description

Keywords

Journal Title

Conference Name

Journal ISSN

Volume Title

Publisher

High Energy Physics, Cavendish Laboratory, University of Cambridge

Publisher DOI

Publisher URL