Effective field theory approaches to B meson decay.
Contributors: Luke, Michael (supervisor)
Published: 2005
Language: eng
Number of pages: 107
Subjects: Physics Theses
Description: For two-body exclusive decays of the form B&macr; &rarr;pipi, pi K, we study   Oa2s b0   perturbative corrections in the QCD factorization formalism, including chirally enhanced power corrections. We discuss the effect of these corrections on direct CP asymmetries, which receive their first contribution at   Oas  . We find that the   Oa2s b0   corrections are often as large as the   Oas   corrections, and that the scale dependence present at leading order is not reduced by the inclusion of the   Oas   corrections. In particular we assess the effect of the perturbative corrections on the direct CP violation parameters of B 0 &rarr; pi+pi-, which provide an interesting constraint on the unitarity triangle.In this thesis we look at a variety of B meson decays. These decays are important for measuring the CKM matrix elements and over-constraining the standard model. We consider two categories of decays: inclusive semi-leptonic and exclusive non-leptonic.Also in the context of QCD factorization, we study two-body exclusive decays of the form B &rarr; D(*) L (L = pi, rho, K) in the heavy quark limit. We perform a renormalon analysis of such processes to determine the order at which nonperturbative factorization breaking power corrections enter the amplitude. We find that a class of leading power corrections to the color octet matrix element, of   O (&Lambda;QCD/mb), vanish in the limit of a symmetric light meson parton distribution function. We discuss the phenomenological significance of this result.Inclusive semi-leptonic B&macr; &rarr; X u&ell;nu&ell; decays are the theoretically cleanest ways to extract the CKM matrix element 
Notes: Thesis (Ph.D.)--University of Toronto, 2005.

Electronic version licensed for access by U. of T. users.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3198.