Abstract
We investigate the possibility that a minimal realization of left-right supersymmetry can be reachable at a high-energy upgrade of the LHC, expected to operate at a center-of-mass energy of 27 TeV. This minimal scenario has a relatively light $SU(2)_R$ doubly-charged Higgs boson, which could decay dominantly into tau-lepton pairs. We explore the associated signals comprised of at least three hadronically-decaying taus, or with at least two hadronic taus and one same-sign-same-flavor charged lepton pair. Our analysis shows that the former signature is challenging to use for getting handles on the signal due to the large corresponding background, and that the latter one can lead to a handful of new physics events in an almost background-free environment. We however find that a signal comprised of three hadronically-decaying tau leptons is likely to be observed at a low luminosity of proton-proton collisions at a 27 TeV upgrade of the LHC.
Highlights
During the last years of operation at the Large Hadron Collider (LHC), no significant deviation from the Standard Model (SM) predictions has been found
We have analyzed the sensitivity of a high-energy upgrade of the LHC expected to operate at a center-ofmass energy of 27 TeV to a class of leftright supersymmetric scenarios favored by dark matter, with a relic density as measured by the Planck collaboration originating from the coannihilations of multiple Higgsino states of about 700 GeV
As previous experimental limits on this state are obtained by assuming a pair-production mode followed by a decay into a same-sign pair of electrons or muons, we focus on the still phenomenologically viable option where the doubly charged Higgs boson decays almost exclusively into tau leptons
Summary
During the last years of operation at the Large Hadron Collider (LHC), no significant deviation from the Standard Model (SM) predictions has been found. In which both supersymmetry and left-right motivations are combined, the same extended gauge symmetry reason leads to the automatic absence of any R-parity-violating interaction This prevents the proton from being unstable and guarantees a viable dark matter candidate as the LSP. On different grounds, imposing a dark matter candidate with the right features, that for instance leads to a relic density in agreement with Planck data, further restricts the possibilities for the particle spectrum as the LSP has to lie within some mass range below 1 TeV [18,19] With this phenomenologically constrained version of LRSUSY at hand, we investigate in this work whether the future highluminosity phase of the LHC (HL-LHC) or its proposed 27 TeV energy upgrade, the so-called high-energy LHC (HE-LHC) [20], could observe or rule out the model once and for all.
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