2025/05/19 by C. P. Haritha, Haritha, C P, Karthik Jain +3
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2505.13323
openalex publication_date 2025/05/19 · openalex created_date 2025/09/28 · openalex updated_date 2026/07/31
The extension of the standard model to include a single scalar or vector leptoquark has been shown to account for the observed deviations in the lepton flavor universality ratios in the b → c ℓ νℓ and b → s ℓ ℓ transitions. Exploring new physics in the b → c τντ decays, in this work we analyze the baryonic decay channels Λb → Λc*(2595,2625) τ- ντ beyond the standard model. Specifically, we investigate the role of leptoquarks in these decays, focusing on the U1 vector leptoquark and the S1 scalar leptoquark. Employing recent lattice QCD results for the Λb → Λc* form factors, the helicity amplitudes for all possible four-fermion interactions are worked out explicitly and presented here. Utilizing the current b → c ℓ νℓ experimental data, we impose constraints on the leptoquark couplings and test new physics sensitivity of various observables for the decay processes under consideration. Our analysis demonstrates the significance of testing the lepton flavor universality ratio R_Λc* as it is observed to be particularly sensitive to these leptoquarks.