Körner, Juergen G.; Melić, Blaženka (2000) Exclusive/inclusive ratio of semileptonic Lambda(b) decays. Physical Review D, 62 (7). 074008107400812. ISSN 15507998

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Abstract
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 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* mesonic IsgurWise functions this bound is established. Applying a BetheSalpeter 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 IsgurWise 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; 2ndorder power corrections; bottom baryon decays; heavyquark; formfactors; bdecays; verticalbar; 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  
Projects: 


Depositing User:  Blaženka Melić  
Date Deposited:  30 Sep 2013 10:50  
URI:  http://fulir.irb.hr/id/eprint/660  
DOI:  10.1103/PhysRevD.62.074008 
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