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Calculation of the B-c leptonic decay constant using the shifted N-expansion method

Ikhdair, Sameer M.
Sever, Ramazan
We give a review and present a comprehensive calculation for the leptonic constant fB(c) of the low-lying pseudoscalar and vector states of B-c-meson in the framework of static and QCD-motivated nonrelativistic potential models taking into account the one-loop and two-loop QCD corrections in the short distance coefficient that governs the leptonic constant of B-c quarkonium system. Further, we use the scaling relation to predict the leptonic constant of the nS-states of the bc system. Our results are compared with other models to gauge the reliability of the predictions and point out differences.