New Physics Scenarios in b → c ℓ ν_ℓ decays

2014/11/06 by Fulvia De Fazio, De Fazio, Fulvia
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle Accelerators and Free-Electron Lasers #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Superconducting Materials and Applications #hep-ph

paper · pdf · doi:10.48550/arxiv.1411.1642

LaTex,5 figures. Proceedings of the 8th International Workshop on the CKM Unitarity Triangle (CKM 2014), Vienna, Austria, September 8-12, 2014

arxiv created 2014/11/06 · openalex publication_date 2014/11/06 · arxiv updated 2014/11/07 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

The latest BaBar measurements of the ratios \cal R(D^(*))=\frac\cal B(B → D^(*) τ ν_τ)\cal B(B → D^(*) μ ν_μ) deviate from the Standard Model predictions at the global level of 3.4σ. A possibility to reproduce these experimental ratios without affecting other modes which do not show similar deviations is to consider new physics scenarios producing an additional tensor operator in the effective weak Hamiltonian. I describe the impact of such an operator in semileptonic B → D^(*) modes and in semileptonic B and B_s decays to excited positive parity charmed mesons. In particular, I discuss the most effective observables able to discriminate new physics from the Standard Model.

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