New physics effects on B→ D^(*)τν decays

2024/11/29 by Jong-Phil Lee, Lee, Jong-Phil
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.2411.19843

openalex publication_date 2024/11/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We investigate new physics effects on B→ D^(*)τν decays in a general and model-independent way. The χ² fits for fractions of the branching ratios R(D^(*)) and other polarization parameters are implemented. We parameterize the relevant Wilson coefficients with a new physics scale and its power together with combined fermionic couplings. Constraints from B_c→τν are imposed such that its branching ratio is less than 30%. For a moderate range of our parameters we find that the new physics scale goes up to \lesssim 27 TeV for ordinary new particle contributions. It turns out that the polarization asymmetry of τ for B→ D transition can be negative only for a few combinations of the new physics operators. We also discuss related processes B_c→ J/Ψτν and Λ_b→Λ_cτν decays.

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