General Conditions for Lepton Flavour Violation at Tree- and 1-Loop Level

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dc.creatorBlum, Alexander
dc.creatorMerle, Alexander
dc.date2007-09-20
dc.date.accessioned2026-07-07T11:37:21Z
dc.date.available2026-07-07T11:37:21Z
dc.descriptionIn this work, we compile the necessary and sufficient conditions a theory has to fulfill in order to ensure general lepton flavour conservation, in the spirit of the Glashow-Weinberg criteria for the absence of flavour-changing neutral currents. At tree-level, interactions involving electrically neutral and doubly charged bosons are investigated. We also investigate flavour changes at 1-loop level. In all cases we find that the essential theoretical requirements can be reduced to a few basic conditions on the particle content and the coupling matrices. For 1-loop diagrams, we also investigate how exactly a GIM-suppression can occur that will strongly reduce the rates of lepton flavour violating effects even if they are in principle present in a certain theory. In all chapters, we apply our criteria to several models which can in general induce lepton flavour violation, e.g. LR-symmetric models or the MSSM. In the end we give a summarizing table of the obtained results, thereby demonstrating the applicability of our criteria to a large class of models beyond the Standard Model.
dc.description31 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/0709.3294
dc.identifierhttp://arxiv.org/abs/0709.3294
dc.identifierPhys.Rev.D77:076005,2008
dc.identifierdoi:10.1103/PhysRevD.77.076005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199181
dc.subjectHigh Energy Physics - Phenomenology
dc.titleGeneral Conditions for Lepton Flavour Violation at Tree- and 1-Loop Level
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