| DATE: |
2005-10-11 16:00 - 17:00 |
| PLACE: |
Room 345 of the building 4, 3rd floor |
| TITLE: |
Physics Seminar: The DGE approach to inclusive B decay spectra |
| CONTACT: |
4342 |
| SPEAKER: |
Einan Gardi (University of Cambridge) |
| LANGUAGE: |
English |
| URL: |
http://seminar.kek.jp/physics/index.html |
| ABSTRACT: |
I will review the application of Dressed Gluon Exponentiation (DGE) to inclusive B decay spectra. I will first demonstrate the renormalon problem in conventional Sudakov resummation and show how this problem is solved by computing the Sudakov exponent as well as the pole mass using Principal-Value Borel summation. I will explain the relation between the calculation of the Sudakov factor beyond logarithmic accuracy and the parametrization of non-perturbative power corrections near threshold (the "shape function"). I will
then present numerical predictions of the partial branching fraction as well as spectral moments with experimentally relevant cuts for photon spectrum in B -> X_s gamma and the triple differential width in B -> X_u l nu and conclude by discussing the consequences for precision measurement of V_ub. |
