ar X iv : h ep - p h / 06 01 18 1 v 1 21 J an 2 00 6 Progress in computing inclusive B decay spectra
نویسنده
چکیده
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”.
منابع مشابه
ar X iv : h ep - p h / 02 06 06 1 v 2 9 J un 2 00 2 B̄ 0 → π + X in the Standard Model
In this paper we investigate the possibility of studying B → π form factor using the semi-inclusive decays ¯
متن کاملar X iv : h ep - p h / 02 06 06 1 v 1 6 J un 2 00 2 B̄ 0 → π + X in the Standard Model
In this paper we investigate the possibility of studying B → π form factor using the semi-inclusive decays ¯ B 0 → π + + X q. In general B → P X semi-inclusive decays involve several hadronic parameters. But for ¯ B 0 → π + X q decays we find that in the factorization approximation, the only unknown hadronic parameters are the form factors F B→π 0,1. Therefore these form factors can be studied ...
متن کاملar X iv : h ep - p h / 06 08 19 8 v 1 18 A ug 2 00 6 The future of particle physics ⋆
I review the prospects for future progress in accelerator-based particle physics
متن کاملar X iv : h ep - p h / 95 06 21 3 v 1 1 J un 1 99 5 Inclusive and Exclusive Semi - Leptonic Decays of B Mesons
In this paper, the semileptonic decays of heavy mesons are treated fully relativis-tically. By means of an effective vertex, the effect of Fermi momentum are included both at the inclusive and at the exclusive levels, and the spin of both parent and daughter particles are taken into account. The differential decay rates with respect to the lepton energy and momentum transfer are compared with d...
متن کامل