2017/08/30 by F. Betti, Betti, Federico
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1708.09148
openalex publication_date 2017/08/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The observable R ( D(*) ) = B( B0→ D(*)- τ+ ντ ) / B( B0→ D(*)- μ+ νμ ) is a probe for Lepton Universality violation, so it is sensitive to New Physics processes. The current combination of the measurements of R ( D(*) ) differs from Standard Model predictions with a 4σ significance. A measurement of R ( D^* ) using three-prong τ decays has been performed at LHCb, resulting in R(D^*) = 0.285 ± 0.019 (stat) ± 0.025(syst) ± 0.014 (ext). This value, combined with the LHCb result obtained with τ→ μντνμ decays, gives R(D^*) = 0.306 ± 0.016 (stat) ± 0.022 (syst), consistent with the world average and 2.1 standard deviations above the SM prediction.