Abstract
The aim of this paper is to showcase the novel multilepton signals, hitherto unexplored at the LHC, arising from the heavier electroweakinos, in several generic pMSSMs at the upcoming LHC experiments. We first briefly review our old constraints on the full electroweakino sector of these models, containing both lighter and heavier sparticles, using the ATLAS trilepton data from the LHC Run I. Next we derive new stronger constraints on this sector for the first time using the ATLAS Run II data. We identify some benchmark points and explore the prospect of observing multilepton events in future LHC experiments. Our focus is on the channels with n > 3 which are the hallmarks of the heavier electroweakinos. If the spectrum of the lighter electroweakinos is compressed, these signals might very well be the discovery channels of the electroweakinos at the high luminosity LHC. We also discuss the implications of the new LHC constraints for the observed dark matter relic density of the universe, the measured value of the anomalous magnetic moment of the muon and the dark matter direct detection experiments.
Highlights
If this is the case the best bet for SUSY discovery is to search for the spin-1/2 sparticles belonging to the electroweak (EW) sector
We perform detail scanning of the parameter space of each of the generic model described in section 2 subjected to three constraints — ATLAS eweakino search data in the 3l + E/T channel at the LHC Run II, the observed Dark Matter (DM) relic density of the universe and the experimentally measured anomalous magnetic moment of the muon and identify the allowed parameter space (APS) for each of them
We first constrain the full eweakino sector of several generic phenomenological MSSM (pMSSM), described in section 2, using the ATLAS model independent upper bound on the number of any BSM event from trilepton searches at Run II of the LHC [16]
Summary
If this is the case the best bet for SUSY discovery is to search for the spin-1/2 sparticles belonging to the electroweak (EW) sector. The LHC collaborations usually derive the constraints from the search results in the so called simplified models [11,12,13,14,15,16] These models may be obtained after imposing some simplifying assumptions on the general MSSM which reduce the number of free parameters. It has been shown that in some regions of the parameter space the predictions of the pMSSM resemble that of the simplified models employed by the ATLAS group quite well and the resulting limits are very similar (for comparisons using Run I and Run II data, see figure 1 of [17], figure 7, 8 of [20] and figure 1 of this paper).
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