Studies on B-Meson Decays in the Framework of Bethe-Salpeter Equation(BSE)
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Date
2010-07
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Addis Ababa University
Abstract
In this thesis, we rst study the lagrangian formulation of gauge theories, QED, Yang-
Mills theory and the Glashow-Weinberg-Salam model for Electroweak interaction. We
then, we use the framework of Bethe-Salpeter equation (BSE) under Covariant Instan-
taneous Ansatz (CIA) to calculate the leptonic decays of B-meson. The structure of
hadron-quark vertex function (^q) is obtained from BSE under CIA, while the structure
of q qW vertex is obtained from GWS model for Electroweak interactions. We derive for-
mulas for the decay constant fB of B-meson. We obtain the numerical values of the decay
constant, fB of the B-meson as well as its decay width. Then the results are compared
with existing experimental results
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Studies on B-Meson Decays