Abstract
Abstract A recently proposed class of supersymmetric models predicts rather light and nearly mass-degenerate higgsinos, while the other superparticles are significantly heavier. In this paper we study the early LHC phenomenology of a benchmark model of this kind. If the squarks and gluinos, and in particular the lighter stop, are still light enough to be within reach, then evidence for our model can be found in hadronic SUSY searches. Moreover, with dedicated searches it will be possible to distinguish the light higgsino model from generic SUSY models with a bino LSP. Search channels with b-jets and with isolated leptons play a crucial role for model discrimination.
Highlights
JHEP01(2012)122 focus on the less extreme case where the mass separation between higgsinos and coloured superparticles is large, but not so large that the latter are altogether out of reach
In this paper we study the early LHC phenomenology of a benchmark model of this kind
Should candidate SUSY signatures be observed within the year, it will be interesting to see how much can already be found out about the underlying model at the early LHC
Summary
The MSSM with light higgsinos and otherwise heavy superparticles has previously been studied e.g. in [8]. To briefly motivate the models of [1], we start by observing that, in certain grandunified models which naturally emerge from string constructions, there is a large number of vector-like states in incomplete GUT multiplets which should decouple close to the GUT scale They serve as messengers for gauge-mediated supersymmetry breaking, inducing gaugino masses and scalar soft masses. HH50′ is defined in the same way, but with the soft terms of the third generation chosen differently: Third-generation squarks and sleptons were given a universal soft mass m(03) = 300 GeV and a trilinear A-parameter A(03) = −1 TeV This choice was made in order to have a reference spectrum whose t1t∗1 production cross section is comparable to that of Spectrum I, while closely resembling the CMSSM.
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