Measurement of R(D^*) with Three-Prong τ Decays at LHCb

2017/05/30 by F. Betti, Federico 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 #hep-ex

paper · pdf · doi:10.48550/arxiv.1705.10651

Proceeding of the 52nd Rencontres de Moriond EW 2017, La Thuile, Italy, March 18-25, 2017

arxiv created 2017/05/30 · openalex publication_date 2017/05/30 · arxiv updated 2019/08/13 · openalex created_date 2022/09/30 · openalex updated_date 2026/07/28

Abstract

The observable R ( D^(*) ) = B( B⁰→ D^(*)- τ⁺ ν_τ ) / B( B⁰→ D^(*)- μ⁺ ν_μ ) 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 is currently ongoing at LHCb. The statistical precision of this analysis is 6.7%, i.e. the smallest statistical uncertainty for a single measurement of this observable. Therefore this measurement will be important to confirm or disprove the current discrepancy from the theoretical expectations.

Related

• Tests of Lepton Flavour Universality with Semileptonic Decays at LHCb
• Measurement of R(D) and R(D^*) with a semileptonic tagging method
• Recent B → D^(*) τ^- ν_τ Studies at Belle
• Lepton-flavour universality tests with semi-leptonic B decays at LHCb
• Measurement of R(D) and R(D^∗) with a semileptonic tagging method