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Exclusive/inclusive ratio of semileptonic Lambda(b) decays

Körner, Juergen G.; Melić, Blaženka (2000) Exclusive/inclusive ratio of semileptonic Lambda(b) decays. Physical Review D, 62 (7). 074008-1-074008-12. ISSN 1550-7998

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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.

Item Type: Article
Uncontrolled Keywords: quark effective theory; 2nd-order power corrections; bottom baryon decays; heavy-quark; form-factors; b-decays; vertical-bar; transitions; model; expansion
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Divisions: Theoretical Physics Division
Project titleProject leaderProject codeProject type
Teorijska istraživanja osobina fundamentalnih česticaGuberina, Branko00980102MZOS
Depositing User: Blaženka Melić
Date Deposited: 30 Sep 2013 10:50
DOI: 10.1103/PhysRevD.62.074008

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