July 25, 2007 to August 1, 2007
Karlsruhe University
Europe/Zurich timezone

Sneutrino-antisneutrino mixing at future colliders

Jul 30, 2007, 2:00 PM
20m
Gaede-Auditorium (Karlsruhe University)

Gaede-Auditorium

Karlsruhe University

Wolfgang-Gaede-Str. 1 76131 Karlsruhe Germany
Parallel Talk Colliders - Susy Phenomenology Colliders - Susy Phenomenology 7 (Theory)

Speaker

Mr Tuomas Honkavaara (Helsinki Institute of Physics)

Description

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''. In an $e^- \gamma$ collider, the signal of the associated production of an electron-sneutrino and the lighter chargino and the subsequent decays can be $e^- \gamma \rightarrow e^+{\tilde \tau}_1^-{\tilde\tau}_1^- + {p_T \hspace{-.9em}/\;\:}$ 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 (AMSB) scenario [1]. At the LHC, sneutrino-antisneutrino mixing can result in a like-sign dilepton signal either through direct sneutrino production or through squark and gluino production. The mixing can also be probed through sneutrino-slepton production. However, in an AMSB scenario, the number of like-sign dilepton signals through sneutrino oscillation is quite small, and backgrounds present a problem for the detectability [2]. [1] T. Honkavaara, K. Huitu, S. Roy, Phys. Rev. D73, 055011 (2006). [2] D.K. Ghosh, T. Honkavaara, K. Huitu, S. Roy, in preparation.

Primary author

Mr Tuomas Honkavaara (Helsinki Institute of Physics)

Co-authors

Dr Dilip Ghosh (University of Delhi) Prof. Katri Huitu (Helsinki Institute of Physics and University of Helsinki) Prof. Sourov Roy (Indian Association for the Cultivation of Science)

Presentation materials