373 research outputs found

    Selected topics on tau physics

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    The B Factories have generated a large amount of new results on the tau lepton. The present status of some selected topics on tau physics is presented: charged-current universality tests, bounds on lepton-flavour violation, the determination of alpha_s from the inclusive tau hadronic width, and the measurement of |V_{us}| through the Cabibbo-suppressed decays of the tau lepton.Comment: Invited talk at the XXXI International Conference of Theoretical Physics, "Matter to the Deepest", Ustron, Poland, 5-11 September 200

    The Standard Model of Electroweak Interactions

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    Gauge invariance is a powerful tool to determine the dynamical forces among the fundamental constituents of matter. The particle content, structure and symmetries of the Standard Model Lagrangian are discussed. Special emphasis is given to the many phenomenological tests which have established this theoretical framework as the Standard Theory of the electroweak interactions: electroweak precision tests, Higgs searches, quark mixing, neutrino oscillations. The present experimental status is summarized.Comment: Based on lectures given at the 6th CERN-Fermilab Hadron Collider Physics Summer School (Geneva, 2011), 2010 European School of HEP (Raseborg, Finland), 2010 Int. School on Astroparticle Physics (Zaragoza, Spain), 2010 IDPASC School (Sesimbra, Portugal) and 2009 Int. Summer School and Conference on HEP (Mugla, Turkey, 2009). 52 pages, 38 figure

    The Standard Model of Particle Physics: Status & Low-Energy Tests

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    Precision measurements of low-energy observables provide stringent tests of the Standard Model structure and accurate determinations of its parameters. An overview of the present experimental status is presented. The main topics discussed are the muon anomalous magnetic moment, the asymptotic freedom of strong interactions, the lepton universality of gauge couplings, the quark flavour structure and CP violation.Comment: 12 pages, 6 Postscript Figure

    Flavour Dynamics and Violations of the CP Symmetry

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    An overview of flavour physics and CP-violating phenomena is presented. The Standard Model quark-mixing mechanism is discussed in detail and its many successful experimental tests are summarized. Flavour-changing transitions put very stringent constraints on new-physics scenarios beyond the Standard Model framework. Special attention is given to the empirical evidences of CP violation and their important role in our understanding of flavour dynamics. The current status of the so-called flavour anomalies is also reviewed.Comment: Invited lectures at the 2017 and 2019 CERN - Latin-American Schools of High-Energy Physics (San Juan del R\'io, M\'exico, 8-21 March 2017; and Villa General Belgrano, C\'ordoba Province, Argentina, 13--26 March 2019). 38 pages, 13 figures. Fully updated version (April 2020) with current experimental and theoretical status. arXiv admin note: substantial text overlap with arXiv:1112.4094, arXiv:hep-ph/9601202, arXiv:1201.053
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