Progress in computing inclusive B decay spectra.
Andersen, Jeppe R.
High Energy Physics, Cavendish Laboratory, University of Cambridge
MetadataShow full item record
Gardi, E., & Andersen, J. R. (2006). Progress in computing inclusive B decay spectra.. http://www.dspace.cam.ac.uk/handle/1810/224207
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”.
This record's URL: http://www.dspace.cam.ac.uk/handle/1810/224207
All Rights Reserved
Licence URL: https://www.rioxx.net/licenses/all-rights-reserved/