Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-03-20
JHEP 0905:120,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
35 pages, 23 figures; minor corrections, final version published in JHEP
Scientific paper
10.1088/1126-6708/2009/05/120
The $\mu\nu$SSM has been proposed to solve simultaneously the $\mu$-problem of the MSSM and explain current neutrino data. The model breaks lepton number as well as R-parity. In this paper we study the phenomenology of this proposal concentrating on neutrino masses and the decay of the lightest supersymmetric particle (LSP). At first we investigate in detail the $\mu\nu$SSM with one generation of singlets, which can explain all neutrino data, once 1-loop corrections are taken into account. Then we study variations of the model with more singlets, which can generate all neutrino masses and mixings at tree-level. We calculate the decay properties of the lightest supersymmetric particle, assumed to be the lightest neutralino, taking into account all possible final states. The parameter regions where the LSP decays within the LHC detectors but with a length large enough to show a displaced vertex are identified. Decay branching ratios of certain final states show characteristic correlations with the measured neutrino angles, allowing to test the model at the LHC. Finally we briefly discuss possible signatures, which allow to distinguish between different R-parity breaking models.
Bartl Alfred
Hirsch Manfred
Liebler Stefan
Porod Werner
Vicente Avelino
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