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Exclusive and inclusive semileptonic Lambda(b)-decays

Körner, Juergen G.; Melić, Blaženka (2001) Exclusive and inclusive semileptonic Lambda(b)-decays. Nuclear Physics B - Proceedings Supplements, 93 (1-3). pp. 13-17. ISSN 0920-5632

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In this talk we present theoretical evidence Chat 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-* masonic Isgur-Wise 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 Isgur-Wise function which is determined from the requirement that the exclusive rate should not exceed the inclusive rate. Our pre-Osaka 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.

Item Type: Article
Uncontrolled Keywords: heavy-quark; b-decays; baryons; transitions; currents; model; ratio; mass
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions: Theoretical Physics Division
Project titleProject leaderProject codeProject type
Teorijska istraživanja osobina fundamentalnih česticaGuberina, Branko00980102MZOS
Depositing User: Blaženka Melić
Date Deposited: 27 Sep 2013 12:08
DOI: 10.1016/S0920-5632(00)01049-5

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