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Precise determination of f$_{P_{s}}$/f$_{P}$ and measurement of the "perturbative" pole mass from f$_{P}$
We present a compact analytic two-loop expression of the $SU(3)_f$ breaking effects on the ratio of the pseudoscalar decay constants $R_P \equiv f_{P_S}/f_P$ ($P \equiv D,B $), from which, we extract the precise values : $R_D = 1.15 \pm .04$, $R_B = 1.16 \pm .05 $, where the errors are mainly due to...
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| Lenguaje: | eng |
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1994
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| Acceso en línea: | https://dx.doi.org/10.1016/0370-2693(94)91115-0 http://cds.cern.ch/record/255531 |