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$\Upsilon\overline{B}B$ couplings, slope of the Isgur-Wise function and improved estimate of $V_{cb}$
We estimate the sum of the \Upsilon \bar BB couplings using QCD Spectral Sum Rules (QSSR). Our result implies the phenomenological bound \xi'(vv'=1) \geq -1.04 for the slope of the Isgur-Wise function. An analytic estimate of the (physical) slope to two loops within QSSR leads to the accur...
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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)90092-2 http://cds.cern.ch/record/260252 |