https://doi.org/10.1051/epjconf/202431204005
New physics prospects in semileptonic Λb → Λc* decays
School of Physics, University of Hyderabad, Hyderabad 500046, India
* e-mail: harithacp2010@gmail.com
** e-mail: barilang05@gmail.com
Published online: 20 November 2024
Observations of flavor anomalies in the b-sector, particularly the deviations in the measurements of the lepton flavor universality ratios in the b → cτντ transitions from the standard model (SM) predictions, suggest the existence of possible new physics beyond the SM. In the pursuit of new physics in similar decays involving b → cℓνℓ transitions, we scrutinize the decay modes Λb Λc*(2595, 2625)τ−ν¯τ beyond the SM. In particular, we examine the impact of the presence of leptoquarks in these decay modes, within the framework of the vector leptoquark U1 model. We employ form factors obtained from lattice QCD (LQCD) calculations to predict various q2-dependent observables. Some of these observables include the differential branching fraction, the ratio of branching fractions and the forward-backward asymmetry of the charged lepton. The new couplings are constrained using current b → cℓνℓ experimental data.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
