Abstract
Supersymmetric models with R-parity violation (RPV) have become more popular following the lack of any excess of missing energy events at the 8 TeV LHC. To identify such models, the suggested searches generally rely on the decay products of the (effectively) lightest supersymmetric particle (LSP), with signals that depend on the identity of the LSP and the relevant RPV operators. Here we look at the prospects for detecting RPV chargino decays at the LHC and find substantial patches of parameter space in the Minimal Supersymmetric Standard Model with possibly spectacular signatures, such as three charged-lepton resonances.
Highlights
Models with almost-degenerate electroweak gauginos, where such chargino decays can be expected, arise for example in the context of anomaly-mediated supersymmetry breaking [3, 4]
We present an update on how near-degenerate electroweak gauginos arise in general supersymmetry breaking models described by the MSSM, and to what extent they are compatible with the recent discovery of a new boson at the LHC, when interpreted as the light SM-like Higgs state of the MSSM [16, 17], and other direct and indirect constraints
From the scan it is clear that a wino lightest supersymmetric particle (LSP) is preferred in the MSSM, M2 < |μ|, when we restrict ourselves to models with small ∆m
Summary
In the MSSM, the free mass parameters in the neutralino mass matrix at tree level are M1, M2 and μ. M2 < |M1|, μ, the tree-level mass difference expanded in 1/μ is [9, 10] Note that while this can give a negative ∆m for negative M1, these tree-level terms are all small for large tan β, and for tan β → ∞ the lowest contributing order is 1/μ4. This means that loop effects can be significant. In addition to the above, we have loop corrections that mainly stem from top-stop and γ(Z)-higgsino loops The former can have either sign depending on the stop mixing, while the latter is small unless tan β is large. Both are included in the scan that will be performed
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