In this work we build a gauge model based on the SUð3Þ c SUð3Þ L Uð1Þ N symmetry with heavy neutrinos and show that we can have two weakly interacting cold dark matter candidates in its spectrum. This is achieved by noticing that a global Uð1Þ symmetry can be imposed on the model in such a way that the stability of the dark matter is guaranteed. We obtain their relic abundance and analyze their compatibility with recent direct detection experiments, also exploring the possibility of explaining the two events reported by CDMSII. An interesting outcome of this 3-3-1 model, concerning direct detection of these WIMPs, is a strong bound on the symmetry breaking scale, which imposes it to be above 3 TeV.
We analyze the potential of the CERN Large Hadron Collider (LHC) to study the structure of quartic vector-boson interactions through the pair production of electroweak gauge bosons via weak boson fusion qq → qqW W . In order to study these couplings we have performed a partonic
We analyze the potential of the Next Linear e ϩ e Ϫ Collider to study anomalous quartic vector-boson interactions through the processes e ϩ e Ϫ →W ϩ W Ϫ Z and ZZZ. In the framework of SU (2) Lagrangians, we examine all effective operators of order p 4 that lead to four-gauge-boson interactions but do not induce anomalous trilinear vertices. In our analysis, we take into account the decay of the vector bosons to fermions and evaluate the efficiency in their reconstruction. We obtain the bounds that can be placed on the anomalous quartic interactions and we study the strategies to distinguish the possible couplings.
͓S0556-2821͑98͒01515-X͔PACS number͑s͒: 13.65.ϩi, 12.39.Fe
Recently, refinements have been made on both the theoretical and experimental determinations of i.) the mass of the lightest Higgs scalar, ii.) the relic density of cold dark matter in the universe, iii.) the branching fraction for the radiative b → sγ decay, iv.) the muon anomalous magnetic moment, and v.) the flavor violating decay Bs → µ + µ − . In this work, we present constraints from each of these quantities on the minimal supergravity model as embedded in the updated version of the computer program ISAJET v7.64. Improvements and updates since our published work are especially emphasized. The combination of constraints points to certain favored regions of model parameter space where collider and non-accelerator SUSY searches may be more focused. * Talk given by C. Balázs at SUSY02.
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