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|Title: ||VECTOR MESON DECAY CONSTANTS WITH INCLUSION OF BOTH LO AND NLO DIRAC COVARIANTS IN HADRON-QUARK VERTEX|
|Authors: ||Yikdem, Mengesha|
|Advisors: ||Dr. Shashank Bhatnagar|
|Keywords: ||NLO DIRAC|
|Copyright: ||Jul-2009 |
|Date Added: ||22-May-2012 |
|Publisher: ||ADDIS ABABA UNIVERSITY|
|Abstract: ||The Bethe-Salpeter equation (BSE) provides a non-perturbativ method of treating
the relativistic two-particle bound state problems on the basis of covariant instantaneous
ansatz (CIA). On this basis, the structure of the hadron-quark vertex function
(ˆq) of vector mesons is derived from a QCD motivated Bethe-salpeter (BS) frame
work and it is generalized to include various Dirac covariants (other than i
their complete set. They are incorporated in accordance with a naive power counting
rule order-by-order in powers of the inverse of the meson mass.
We study vector meson decay constants with inclusion of both the leading order
(LO) and the next-to-leading order (NLO) Dirac Covariants, in addition to i
the Hadron-Quark vertex function (ˆq) from their complete set on the basis of power
counting rule through the frame work of BSE under covariant instantaneous ansatz.
|Appears in:||Thesis - Physics|
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