Exclusive semi-leptonic decays of bottom mesons in the spectator quark model |
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Authors: | J G Körner G A Schuler |
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Institution: | 1. Institut für Physik, Universit?t, D-6500, Mainz, Federal Republic of Germany 2. Deutsches Elektronen Synchroton DESY, D-2000, Hamburg, Federal Republic of Germany
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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 max 2 = (M 1 ?M 2)2. We find agreement atq max 2 . 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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