Precision Tau Physics

By A. Pich. 2013

324 citations recorded by the source corpus.

Abstract Precise measurements of the lepton properties provide stringent tests of the Standard Model and accurate determinations of its parameters. We overview the present status of τ physics, highlighting the most recent developments, and discuss the prospects for future improvements. The leptonic decays of the τ lepton probe the structure of the weak currents and the universality of their couplings to the W boson. The universality of the leptonic Z couplings has also been tested through Z → l + l − decays. The hadronic τ decay modes constitute an ideal tool for studying low-energy effects of the strong interaction in very clean conditions. Accurate determinations of the QCD coupling and the Cabibbo mixing V u s have been obtained with τ data. The large mass of the τ opens the possibility to study many kinematically-allowed exclusive decay modes and extract relevant dynamical information. Violations of flavour and CP conservation laws can also be searched for with τ decays. Related subjects such as μ decays, the electron and muon anomalous magnetic moments, neutrino mixing and B -meson decays into τ leptons are briefly covered. Being one the fermions most strongly coupled to the scalar sector, the τ lepton is playing now a very important role at the LHC as a tool to test the Higgs properties and search for new physics at higher scales.

Subfields: Biomedical Engineering, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1d0002e58e830f60e22913e2a92675bbc69e65df

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In Biomedical Engineering

In Nuclear and High Energy Physics

Citations in the corpus

Combined explanations of the b→sμ+μ− and b→cτ−ν¯ anomalies: A general model analysis (2018, unknown): “However, a complication arises because there are two such ratios – B(τ → μνν̄/μ → eνν̄) and B(τ → μνν̄/τ → eνν̄) – and their measurements are not in complete agreement with one another [80]:”
Low-energy effective field theory below the electroweak scale: operators and matching (2017, unknown): “[57]) give There is a small (but not signiﬁcant) deviation from unity in G F ( τ → µ ) / F ( τ → e ) .”
Review of lepton universality tests in B decays (2018, methodology): “Similarly, the ratio of the FCCC couplings to the third and first family can be obtained from the combination of the measurements of the τ− → μ−νμντ and of the τ and μ lifetimes [11]: gτ/ge = 1.”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, background): “A large variety of processes involving taus have been used in the last decades to learn about fundamental physics [364].”
Phenomenology of an SU(2) × SU(2) × U(1) model with lepton-flavour non-universality (2016, background): “Leptonic tau decays pose very stringent constraints on lepton flavour universality [85].”