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)
