Relativistic Flux Tube Model Calculation of the Isgur-Wise Function
Olsson, M. G. · Veseli, S.
Original · EN
The Relativistic Flux Tube model is used to calculate of the Isgur-Wise functions describing the exclusive semileptonic decays of B and Bₛ 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 B D*lνₗ decay distribution yield the CKM element Vbc=0.035± 0.001. The IW function slope and second derivative at the zero recoil point are predicted to be ξ'(1) = -0.93± 0.04 and ξ''(1)= 1.7± 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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