Abstract
We calculate the exclusive semileptonic bottom meson decays\(B \to D(D*) + l^ - + \bar v_l \) in the spectator quark model. The helicity structure of the mesonic current transitionsB→D(D *) is matched to the helicity structure of the free quark current transitionsb→c at minimum momentum transferq 2=0. The results are continued toq 2≠=0 by pole-dominated form factors. Our results are compared to recent calculations that use quark model dynamics at maximum momentum transferq 2max = (M 1 −M 2)2. We find agreement atq 2max . Atq 2=0 there are significant differences between the predictions of the two approaches leading to marked differences in the predictions for the shape of the lepton energy spectrum, the shape of theq 2-distribution, and the helicity composition of the transition measurable in the angular distributions of the decaysD *→Dπ and\(W_{virtual}^ - \to l^ - + \bar v_l \).
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Körner, J.G., Schuler, G.A. Exclusive semi-leptonic decays of bottom mesons in the spectator quark model. Z. Phys. C - Particles and Fields 38, 511–518 (1988). https://doi.org/10.1007/BF01584403
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DOI: https://doi.org/10.1007/BF01584403