Abstract
Higgsino has been intensively searched for in the LHC experiments in recent years. Currently, there is an uncharted region beyond the LEP Higgsino mass limit where the mass splitting between the neutral and charged Higgsinos is around 0.3-1GeV, which is unexplored by either the soft di-lepton or disappearing track searches. This region is, however, of great importance from a phenomenological point of view, as many supersymmetric models predict such a mass spectrum. In this Letter, we propose a possibility of filling this gap by using a soft microdisplaced track in addition to the monojet event selection, which allows us to discriminate a signature of the charged Higgsino decay from the standard model background. It is found that this new strategy is potentially sensitive to a Higgsino mass of ≲180(250) GeV at the LHC Run2 (HL-LHC) for a charged-neutral mass splitting of ≃0.5 GeV.
Highlights
Introduction.—The absence of a dark matter (DM) candidate in the standard model (SM) invokes the strongest motivation for the extension of the SM
There is an uncharted region beyond the LEP Higgsino mass limit where the mass splitting between the neutral and charged Higgsinos is around 0.3–1 GeV, which is unexplored by either the soft di-lepton or disappearing track searches
In this Letter, we propose a possibility of filling this gap by using a soft microdisplaced track in addition to the monojet event selection, which allows us to discriminate a signature of the charged Higgsino decay from the standard model background
Summary
Hajime Fukuda ,1,2 Natsumi Nagata, Hideyuki Oide ,4 Hidetoshi Otono ,5 and Satoshi Shirai. There is an uncharted region beyond the LEP Higgsino mass limit where the mass splitting between the neutral and charged Higgsinos is around 0.3–1 GeV, which is unexplored by either the soft di-lepton or disappearing track searches. This region is, of great importance from a phenomenological point of view, as many supersymmetric models predict such a mass spectrum. In some cases, the Higgsino mass is radiatively generated from the gaugino loops and suppressed by a loop factor compared to the gaugino masses [7] These theoretical considerations suggest that Higgsino is rather light and potentially accessible by the LHC experiments. This Letter proposes a new strategy to explore this region by utilizing a soft pion from the decay of a charged
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