Exclusive and inclusive semileptonic Lambda_b-Decays (CROSBI ID 482751)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Melić, Blaženka ; Koerner, J.G.
engleski
Exclusive and inclusive semileptonic Lambda_b-Decays
In this talk 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 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.
semileptonic; Lambda_b; B-decays
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Podaci o prilogu
13-17.
2001.
objavljeno
Podaci o matičnoj publikaciji
Valencia 2000, Hyperons, charm and beauty hadrons, Nucl. Phys. B, Proc. Suppl. 93 (2001)
C.S. Kalman, Z. Ligeti, M.A. Sanchis-Lozano, J. Salt, V. Gimenez
Amsterdam: North-Holland
Podaci o skupu
Nepoznat skup
predavanje
29.02.1904-29.02.2096