A. Mondragón, M. Mondragón, and E. Peinado
Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20–364, México, D.F. 01000 México.
Recibido el 18 de marzo de 2008
Aceptado el 15 de junio de 2008
Abstract
]]> A variety of lepton flavour violating effects related to the recent discovery of neutrino oscillations and mixings is here systematically discussed in terms of an S3–flavour permutational symmetry. After presenting some relevant results on lepton masses and mixings, previously derived in a minimal S3–invariant extension of the Standard Model, we compute the branching ratios of some selected flavour–changing neutral current processes (FCNC) as well as the contribution of the exchange of neutral flavour–changing scalar to the anomaly of the magnetic moment of the muon. We found that the minimal S3 –invariant extension of the Standard Model describes successfully masses and mixings, as well as, all flavour changing neutral current processes in excellent agreement with experiment.Keywords: Flavour symmetries; quark and lepton masses and mixings; neutrino masses and mixings; flavour changing neutral currents; muon anomalous magnetic moment.
Resumen
Una multiplicidad de efectos de violación del sabor leptónico relacionados con el reciente descubrimiento de oscilaciones y mezclas de los neutrinos son discutidos aquí en términos de una simetría permutacional S3 del sabor. Después de presentar algunos resultados relevantes acerca de masas y mezclas de leptones, derivados anteriormente en una extensión mínima S3 –invariante del Modelo Estándar, calculamos las tasas de ramificación de algunos procesos que cambian el sabor leptónico (FCNC) así como la contribución debida al intercambio de escalares neutros que cambian el sabor a la anomalía del momento magnético del muón. Encontramos que la extensión mínima S3–invariante del Modelo Estándar describe con éxito masas y mezclas, los procesos que ocurren por intercambio de corrientes neutras que violan el sabor en excelente acuerdo con los experimentos.
Descriptores: Simetrías del sabor; masas y mezclas de quarks y leptones; masas y mezclas de neutrinos; corrientes neutras que violan el sabor; momento magnético anómalo del muón.
PACS: 11.30.Hv; 12.15.Ff; 14.60.Pq
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]]>Acknowledgements
We thank Prof. Jens Erler and Dr. Genaro Toledo–Sanchez for helpful discussions about g – 2. This work was partially supported by CONACYT México under contract No 51554–F and by DGAPA–UNAM under contract PAPIIT–IN115207–2.
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