Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-12-16
Int.J.Mod.Phys.E20:1437-1454,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
article and four figures
Scientific paper
10.1142/S0218301311018460
We have employed the framework of Bethe-Salpeter equation under covariant instantaneous ansatz to calculate leptonic decay constants of unequal mass pseudoscalar mesons like pi, K, D, Ds and B and radiative decay constants of neutral pseudoscalar mesons like pi and etac in two photon decays of these mesons. In the Dirac structure of hadronic BS wave function, the covariants are incorporated from their complete set in accordance with a recently proposed power counting rule, order-by-order in powers of inverse of meson mass. The decay constants are calculated with the incorporation of both Leading order (LO) and the Next-to-leading order (NLO) Dirac covariants. The contribution of both LO as well as NLO Dirac covariants are studied in detail in this paper. The results are found to improve dramatically and hence validating the power counting rule which also provides a practical means of incorporating Dirac covariants in the BS wave function for a hadron.
Bhatnagar Shashank
Li Shi-Yuan
Mahecha Jorge
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