Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-08-06
Nucl.Phys.B583:182-210,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex, 27 pages, including 11 figures. Version to be published in Nucl. Phys. B
Scientific paper
10.1016/S0550-3213(00)00344-8
We study the decays of the lightest top squark in supergravity models with and without R-parity. Using the simplest model with an effective explicit bilinear breaking of R-parity and radiative electroweak symmetry breaking we show that, below the threshold for decays into charginos $\tilde t_1\to c\chi^+_1$, the lightest stop decays mainly into third generation fermions, $\tilde t_1\to b\tau$ instead of the R-parity conserving mode $\tilde t_1\to c\chi^0_1$, even for tiny tau--neutrino mass values. Moreover we show that, even above the threshold for decays into charginos, the decay $\tilde t_1\to b\tau$ may be dominant. We study the role played by the universality of the boundary conditions on the soft supersymmetry breaking terms. This new decay mode $\tilde t_1\to b\tau$ as well as the cascades originated by the conventional $\tilde t_1\to c\chi^0_1$ decay followed by the R-parity violating neutralino decays can provide new signatures for stop production at LEP and the Tevatron.
Diaz Marco A.
Restrepo Diego A.
Valle Jose W. F.
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