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This is my first work that I did for the fulfillment of the requirements for MSc. degree. In this work our purpose is to calculate the pion radiative decay constant using the formulation of BetheSalpeter equation under covariant Instantaneous Ansatz(CIA)after inclusion of both leading(LO) as well as nexttoleading(NLO) terms in the BS wave function of the pion. In this process we also calculate the pion BetheSalpeter Normalizer which is an extremely lengthy calculation.
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