How Stueckelberg Extends the Standard Model and the Mssm

Details How Stueckelberg Extends the Standard Model and the Mssm How Stueckelberg Extends the Standard Model and the Mssm

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasc.conf..437k&link_type=abstract

PASCOS 2004 Part I: Particles, Strings and Cosmology* Part II: Themes in Unification -- The Pran Nath Festschrift†. *,†Proceedin

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Scientific paper

Abelian vector bosons can get massive through the Stueckelberg mechanism without spontaneous symmetry breaking via condensation of Higgs scalar fields. This appears very naturally in models derived from string theory and supergravity. The simplest scenarios of this type consist of extensions of the Standard Model (SM) or the minimal supersymmetric standard model (MSSM) by an extra U(1)X gauge group with Stueckelberg type couplings. For the SM, the physical spectrum is extended by a massive neutral gauge boson Z' only, while the extension of the MSSM contains a CP-even neutral scalar and two extra neutralinos. The new gauge boson Z' can be very light compared to what one has in other models with U(1)' extensions. Among the many new features of the Stueckelberg extension of MSSM, perhaps the most striking one in the possibility of a new lightest supersymmetric particle (LSP) \chi St0 which is mostly composed of Stueckelberg fermions. In this scenario the LSP of MSSM \chi10 is unstable and decays into \chi St0. Such decays alter the signatures of supersymmetry and have impact on searches for supersymmetry in accelerator experiments. Further, with R-parity invariance, \chi St0 is the new candidate for dark matter.

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