engleski

Exclusive/inclusive ratio of semileptonic Lambda(b) decays

We present theoretical evidence that the exclusive/inclusive ratio of semileptonic Lambda(b) decays exceeds that of semileptonic B decays where the experimental exclusive/inclusive ratio amounts to about 66%. We start from the observation that the spectator quark model provides a lower bound on the leading order Isgur-Wise function of the Lambda(b) --> Lambda(c) transition in terms of the corresponding B --> D, D* mesonic Isgur-Wise function. Using experimental data for the B --> D, D* mesonic Isgur-Wise functions this bound is established. Applying a Bethe-Salpeter model including spectator quark interactions and a QCD sum rule estimate of the Lambda(b) --> Lambda(c) transition form factor which satisfy the spectator quark model bound we predict the exclusive/inclusive ratio of semileptonic Lambda(b) decay rates to he in a range between 0.81 and 0.92. We also provide an upper bound on the baryonic Isgur-Wise function which is determined from the requirement that the exclusive rate should not exceed the inclusive rate.

Lambda/b0; semileptonic decay; exclusive decay; inclusive decay

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