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      Charged Lepton Flavour Violation in Supersymmetric Low-Scale Seesaw Models

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          Abstract

          We study charged lepton flavour violation in low-scale seesaw models of minimal supergravity, which realize large neutrino Yukawa couplings thanks to approximate lepton-number symmetries. There are two dominant sources of lepton flavour violation in such models. The first source originates from the usual soft supersymmetry-breaking sector, whilst the second one is entirely supersymmetric and comes from the supersymmetric neutrino Yukawa sector. Within the framework of minimal supergravity, we consider both sources of lepton flavour violation, soft and supersymmetric, and calculate a number of possible lepton-flavour-violating transitions, such as the photonic decays of muons and taus, mu -> e gamma, tau -> e gamma and tau -> mu gamma, their neutrinoless three-body decays, mu -> e e e, tau -> e e e, tau -> mu mu mu, tau -> e e mu and tau -> e mu mu, and the coherent mu -> e conversion in nuclei. After taking into account the exclusion bounds placed by present experiments of lepton flavour violation, we derive combined theoretical limits on the universal heavy Majorana mass scale mN and the light-to-heavy neutrino mixings. Supersymmetric low-scale seesaw models offer distinct correlated predictions for lepton-flavour-violating signatures, which might be discovered in current and projected experiments, such as MEG, COMET/PRISM, Mu2e, super-BELLE and LHCb.

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          Large Muon- and Electron-Number Nonconservation in Supergravity Theories

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            A search for μ-e conversion in muonic gold

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              Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation

              We consider the possibility to detect right-handed neutrinos, which are mostly singlets of the Standard Model gauge group, at future accelerators. Substantial mixing of these neutrinos with the active neutrinos requires a cancellation of different contributions to the light neutrino mass matrix at the level of 10^{-8}. We discuss possible symmetries behind this cancellation and argue that they always lead to conservation of total lepton number. Light neutrino masses can be generated by small perturbations violating these symmetries. In the most general case, LHC physics and the mechanism of neutrino mass generation are essentially decoupled; with additional assumptions, correlations can appear between collider observables and features of the neutrino mass matrix.
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                Author and article information

                Journal
                24 December 2012
                2013-02-28
                Article
                10.1103/PhysRevD.87.053014
                1212.5939
                275797c7-a0a0-47ff-9166-5bcb607780e3

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                MAN/HEP/2012/22
                Phys. Rev. D87 (2013) 053014
                28 pages, 11 figures, comment added to conclusions, version as to appear in Physical Review D
                hep-ph

                High energy & Particle physics
                High energy & Particle physics

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