Signals of sneutrino-antisneutrino mixing in an $e^- γ$ collider in anomaly-mediated supersymmetry breaking

Details Signals of sneutrino-antisneutrino mixing in an $e^- γ$ collider in anomaly-mediated supersymmetry breaking Signals of sneutrino-antisneutrino mixing in an $e^- γ$ collider in anomaly-mediated supersymmetry breaking

2005-12-21

arxiv.org/abs/hep-ph/0512277v2

Phys.Rev. D73 (2006) 055011

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, 6 figures, RevTeX4. Discussion and references added. Typos corrected. To appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.73.055011

Sneutrino-antisneutrino mixing occurs in a supersymmetric model where neutrinos have nonzero Majorana masses. This can lead to the sneutrino decaying into a final state with a "wrong-sign charged lepton". Hence, in an $e^- \gamma$ collider, the signal of the associated production of an electron-sneutrino and the lighter chargino and their subsequent decays can be $e^- \gamma \to e^+ {\tilde \tau}_1^- {\tilde \tau}_1^- + \mpT$ where the ${\tilde \tau}_1$s are long-lived and can produce heavily ionizing charged tracks. This signal is free of any Standard Model background and the supersymmetric backgrounds are small. Such a signal can be experimentally observable under certain conditions which are possible to obtain in an anomaly-mediated supersymmetry breaking scenario. Information on a particular combination of the neutrino masses and mixing angles can also be extracted through the observation of this signal. Possible modifications in the signal event and the accompanying Standard Model background have been discussed when the ${\tilde \tau}_1$s decay promptly.

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