Browsing by Author "Mengesha, Yikdem"

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    Vector Meson Decay Constants With Inclusion Of Both Lo And Nlo Dirac Covariants In Hadron-Quark Vertex
    (Addis Ababa University, 2009-07) Mengesha, Yikdem; Bhatnagar, Shashank (PhD)
    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 .") from 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 .", in 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