02 16 6 v 1 1 6 Fe b 20 07 Calculation of the B c leptonic decay constant using the shifted N - expansion method
نویسندگان
چکیده
We give a review and present a comprehensive calculation for the leptonic constant fBc of the low-lying pseudoscalar and vector states of Bc-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 Bc 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.
منابع مشابه
ar X iv : h ep - p h / 03 02 13 2 v 1 1 7 Fe b 20 03 2 - loop QCD corrections to B c - meson leptonic constant .
We present results for two-loop QCD corrections to the short distance coefficient that governs leptonic decay of Bc-meson. After brief discussion of the technics of asymptotic threshold expansion used to perform this calculation, we give comments on the numerical value of twoloop corrections and its impact on NRQCD description of Bc-meson bound state dynamics.
متن کاملar X iv : h ep - p h / 03 02 13 2 v 3 2 2 Ja n 20 07 2 - loop QCD corrections to B c - meson leptonic constant .
We present results for two-loop QCD corrections to the short distance coefficient that governs leptonic decay of Bc-meson. After brief discussion of the technics of asymptotic expansion used to perform this calculation, we give comments on the numerical value of two-loop corrections and its impact on NRQCD description of Bc-meson bound state. PACS: 12.39.Jh, 13.25.Gv, 14.40.Lb, 14.40.Nd
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