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Relativistic Flux Tube Model Calculation of the Isgur-Wise Function

M. G. Olsson·S. Veseli
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Abstract

The Relativistic Flux Tube model is used to calculate of the Isgur-Wise functions describing the exclusive semileptonic decays of $\bar{B}$ and $\bar{B}_{s}$ mesons. The light quark mass dependence is investigated and the predicted universal function agrees well with the results of lattice simulations, and with the experimental data. Recent experimental measurements of the $\bar{B}\ra D^{*}l\barν_{l}$ decay distribution yield the CKM element $V_{bc}=0.035\pm 0.001$. The IW function slope and second derivative at the zero recoil point are predicted to be $ξ'(1) = -0.93\pm 0.04$ and $ξ''(1)= 1.7\pm 0.1$ for a range of light quark massses. The importance of including higher derivatives in analyses of experiment is emphasized.

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M. G. Olsson, S. Veseli. 1994-10-07. Relativistic Flux Tube Model Calculation of the Isgur-Wise Function. https://doi.org/10.1103/physrevd.51.2224

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