Körner, Juergen G.; Melić, Blaženka
(2001)
Exclusive and inclusive semileptonic Lambda(b)decays.
Nuclear Physics B  Proceedings Supplements, 93
(13).
pp. 1317.
ISSN 09205632
Abstract
In this talk we present theoretical evidence Chat the exclusive/inclusive ratio of semileptonic Lambda (b)decays exceeds that of semileptonic Bdecays, 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 IsgurWise function of the Lambda (b) > Lambda (c) transition in terms of the corresponding B > D, D* mesonic IsgurWise function. Using experimental data for the B > D, D* masonic IsgurWise functions this bound is established. Applying 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 lie in a range between 0.81 and 0.89. We also provide an upper bound on the baryonic IsgurWise function which is determined from the requirement that the exclusive rate should not exceed the inclusive rate. Our preOsaka results are discussed in the light of new recent preliminary experimental results on the pertinent mesonic and baryonic form factors presented at the Osaka ICHEP 2000 Conference.
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