Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-10-04
Nucl.Phys. A663 (2000) 931-934
Physics
High Energy Physics
High Energy Physics - Phenomenology
in Proceedings of the International Conference PANIC '99, Uppsala (Sweden), June 1999
Scientific paper
10.1016/S0375-9474(99)00800-3
The exclusive semileptonic decay Lambda_b -> Lambda_c + l nu_l is investigated including both radiative and first-order power corrections in the inverse heavy-quark mass, while the Isgur-Wise function is calculated within a light-front constituent quark model. It turns out that the dependence on the model parameters can be effectively constrained using recent lattice QCD results at low values of the recoil. Our final predictions for the exclusive semileptonic branching ratio, the longitudinal and transverse asymmetries, and the longitudinal to transverse decay ratio are: Br(Lambda_b -> Lambda_c + l nu_l) = (6.3 \pm 1.6) % |V_{bc} / 0.040|**2 \tau(\Lambda_b) / (1.24 ps), a_L = -0.945 \pm 0.014, a_T = -0.62 \pm 0.09 and R_L/T = 1.57 \pm 0.15, respectively. Moreover, the theoretical uncertainties both on a_L and the (partially integrated) R_L/T are found to be quite small and, therefore, the experimental determination of these quantities is a very interesting tool for testing the Standard Model and for investigating possible New Physics. In this respect the sensitivity to extract unique information both on the strength and phase of possible hadronic right-handed currents is illustrated.
Cardarelli Fabio
Simula Silvano
No associations
LandOfFree
Analysis of the exclusive semileptonic decay Lambda_b -> Lambda_c + l nu_l within a light-front constituent quark model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Analysis of the exclusive semileptonic decay Lambda_b -> Lambda_c + l nu_l within a light-front constituent quark model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analysis of the exclusive semileptonic decay Lambda_b -> Lambda_c + l nu_l within a light-front constituent quark model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-643171