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Your search keyword '"lepton flavour violation"' showing total 4 results
Start Over Descriptor "lepton flavour violation" Journal nuclear physics b
4 results on '"lepton flavour violation"'

1. A limit for the decay from the MEG experiment

Author

Adam, J., Bai, X., Baldini, A., Baracchini, E., Barchiesi, A., Bemporad, C., Boca, G., Cattaneo, P.W., Cavoto, G., Cecchet, G., Cei, F., Cerri, C., De Bari, A., De Gerone, M., Doke, T., Dussoni, S., Egger, J., Galli, L., Gallucci, G., and Gatti, F.

Subjects
*MUON decay, *LEPTONS (Nuclear physics), *FLAVOR in particle physics, *BRANCHING ratios, *PHYSICS experiments, *SPECTROMETERS
Abstract

Abstract: A search for the decay , performed at PSI and based on data from the initial three months of operation of the MEG experiment, yields an upper limit on the branching ratio of (90% C.L.). This corresponds to the measurement of positrons and photons from stopped -decays by means of a superconducting positron spectrometer and a 900 litre liquid xenon photon detector. [Copyright &y& Elsevier]

Published
2010
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2. Enhanced conversion in nuclei in the inverse seesaw model

Author

Deppisch, F., Kosmas, T.S., and Valle, J.W.F.

Subjects
*NUCLEAR reactions, *PARTICLES (Nuclear physics), *NEUTRINOS, *NEUTRINO mass
Abstract

Abstract: We investigate nuclear conversion in the framework of an effective Lagrangian arising from the inverse seesaw model of neutrino masses. We consider lepton flavour violation interactions that arise from short range (non-photonic) as well as long range (photonic) contributions. Upper bounds for the -parameters characterizing conversion are derived in the inverse seesaw model Lagrangian using the available limits on the conversion branching ratio, as well as the expected sensitivities of upcoming experiments. We comment on the relative importance of these two types of contributions and their relationship with the measured solar neutrino mixing angle and the dependence on . Finally we show how the conversion and the rates are strongly correlated in this model. [Copyright &y& Elsevier]

Published
2006
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3. A limit for the decay from the MEG experiment

Author

E. Baracchini, Stefan Ritt, J. Egger, N.P. Kravchuk, F. Xiao, M. Hildebrandt, H. Natori, R. Pazzi, C. Bemporad, Yusuke Uchiyama, A. M. Baldini, G. Piredda, S. Yamada, B. I. Khazin, P.-R. Kettle, Y. Nishimura, G. Gallucci, Y. Hisamatsu, A. Korenchenko, D.N. Grigoriev, A. de Bari, Tomiyoshi Haruyama, Flavio Gatti, M. Panareo, Roberto Di Nardo, F. Ignatov, C. Topchyan, S. Dussoni, V. Tumakov, Satoshi Mihara, M. De Gerone, J. Adam, Hajime Nishiguchi, G. Cecchet, Martin Schneebeli, O. Kiselev, S. Suzuki, C. Cerri, D. Kaneko, R. Valle, G. Cavoto, Ryu Sawada, B. Golden, D. Zanello, G. Boca, Fabrizio Cei, P. W. Cattaneo, W. R. Molzon, C. Voena, T. Iwamoto, L. Galli, T. Doke, A. Barchiesi, A.S. Popov, Angela Papa, D. Mzavia, F. Sergiampietri, Wataru Ootani, A. Maki, Giovanni Signorelli, X. Bai, S. Yamashita, Yu.V. Yudin, M. Grassi, Akira Yamamoto, Toshinori Mori, Donato Nicolo, F. Renga, and Massimo Rossella

Subjects
Superconductivity, Physics, Nuclear and High Energy Physics, Photon, Spectrometer, Branching fraction, Physics::Medical Physics, Analytical chemistry, chemistry.chemical_element, Calorimeter, Nuclear physics, Positron, Xenon, chemistry, High Energy Physics::Experiment, Limit (mathematics), Lepton flavour violation, Muon decay
Abstract

A search for the decay μ + → e + γ , performed at PSI and based on data from the initial three months of operation of the MEG experiment, yields an upper limit on the branching ratio of BR ( μ + → e + γ ) ⩽ 2.8 × 10 − 11 (90% C.L.). This corresponds to the measurement of positrons and photons from ∼ 10 14 stopped μ + -decays by means of a superconducting positron spectrometer and a 900 litre liquid xenon photon detector.

Published
2010

4. Enhanced conversion in nuclei in the inverse seesaw model

Author

Frank F. Deppisch, T.S. Kosmas, and José W. F. Valle

Subjects
Nuclear and High Energy Physics, Particle physics, Nuclear Theory, Solar neutrino, Physics beyond the Standard Model, physics beyond the standard model, standard model, FOS: Physical sciences, z0 decays, Inverse, right symmetry-breaking, neutral heavy-leptons, lepton flavor nonconservation, Nuclear Theory (nucl-th), High Energy Physics - Phenomenology (hep-ph), Seesaw molecular geometry, double-beta-decay, ddc:530, Physics, number, Branching fraction, muon capture, High Energy Physics::Phenomenology, lepton flavour violation, neutrinos, exotic mu-e conversion in nuclei, Muon capture, High Energy Physics - Phenomenology, neutrino mass and mixing, mass, High Energy Physics::Experiment, violation, Neutrino, Lepton
Abstract

We investigate nuclear mu-e conversion in the framework of an effective Lagrangian arising from the inverse seesaw model of neutrino masses. We consider lepton flavour violation interactions that arise from short range (non-photonic) as well as long range (photonic) contributions. Upper bounds for the LFV parameters characterizing mu-e conversion are derived in the inverse seesaw model Lagrangian using the available limits on the mu-e conversion branching ratio, as well as the expected sensitivities of upcoming experiments. We comment on the relative importance of these two types of contributions and their relationship with the measured solar neutrino mixing angle theta_12 and the dependence on theta_13. Finally we show how the LFV mu-e conversion and the mu -> e gamma rates are strongly correlated in this model., 17 pages, Latex, 5 figures

Published
2006

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