DOI 10.1007/s100529800878
Neutralino Cascades in the (M+1)SSM
U. Ellwanger - C. Hugonie
Laboratoire de Physique Théorique et Hautes Energies, Université de Paris-Sud, F-91400 Orsay, France
Received: 10 December 1997 / Revised version: 26 January 1998 / Published online: 26 March 1998
Abstract
In the (M+1)SSM an additional gauge singlet Weyl spinor appears in the
neutralino sector. For a large part of the parameter space this approximative
eigenstate is the true LSP. Then most sparticle decays proceed via an
additional cascade involving the NLSP 
LSP transition, where the
NLSP is the non-singlet next-to-lightest neutralino. We present a comprehensive
list of all processes, which contribute to the NLSP LSP
transition, the partial widths and the total NLSP decay rate. We perform a scan
of the parameters of the model compatible with universal soft terms, and find
that the NLSP life time can be quite large, leading to macroscopically
displaced vertices. Our results imply that the signatures for sparticle
production in the (M+1)SSM can be very different from the MSSM, and are
important for calculations of the abundance of dark matter in this model.
Copyright Springer-Verlag
