Precision tau physics
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- 作者：Antonio Pich
- 关键词：Electroweak and strong interactions ; Leptons ; Standard Model
- 刊名：Progress in Particle and Nuclear Physics
- 出版年：March, 2014
- 年：2014
- 卷：75
- 期：Complete
- 页码：41-85
- 全文大小：1449 K
文摘
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 physics, highlighting the most recent developments, and discuss the prospects for future improvements. The leptonic decays of the lepton probe the structure of the weak currents and the universality of their couplings to the boson. The universality of the leptonic couplings has also been tested through decays. The hadronic 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 have been obtained with data. The large mass of the 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 decays. Related subjects such as decays, the electron and muon anomalous magnetic moments, neutrino mixing and -meson decays into leptons are briefly covered. Being one the fermions most strongly coupled to the scalar sector, the 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.