Abstract
Abstract Within the framework of a constrained Minimal Supersymmetric Standard Model (cMSSM) augmented by an MSSM singlet-pair sector to account for the non-zero neutrino masses by inverse seesaw mechanism, the lightest supersymmetric particle (LSP) can be a mixed sneutrino with mass as small as 50 GeV, satisfying all existing constraints, thus qualifying as a light dark matter candidate. We study the possibility of the lightest neutral Higgs boson in this model decaying invisibly into a pair of sneutrino LSPs, thereby giving rise to novel missing energy signatures at the LHC. We perform a two-parameter global analysis of the LHC Higgs data available till date to determine the optimal invisible Higgs branching fraction in this scenario, and obtain a 2σ (1σ) upper limit of 0.25 (0.15). A detailed cut-based analysis is carried out thereafter, demonstrating the viability of our proposed signal vis-a-vis backgrounds at the LHC.
Highlights
Within the framework of a constrained Minimal Supersymmetric Standard Model augmented by an MSSM singlet-pair sector to account for the non-zero neutrino masses by inverse seesaw mechanism, the lightest supersymmetric particle (LSP) can be a mixed sneutrino with mass as small as 50 GeV, satisfying all existing constraints, qualifying as a light dark matter candidate
We further show that the model parameter space allowed by the invisible Higgs decay constraints can be completely ruled out in case of null results at the generation dark matter (DM) direct detection experiments such as LUX and XENON1T
We have shown that supplementing the constrained Minimal Supersymmetric Standard Model (cMSSM) framework with inverse seesaw mechanism for neutrino masses can give rise to a light sneutrino DM candidate with mass around 50 GeV while being consistent with all the existing collider, cosmological as well as lowenergy constraints
Summary
The sneutrino LSP is in general a linear combination of the superpartners of the LH neutrino and the singlet fermions Several embeddings of this set up have been discussed in the literature within the MSSM gauge group [81] as well as with extended gauge symmetries such as SU(2)L × SU(2)R × U(1)B−L [82,83,84], SU(2)L × U(1)Y × U(1)B−L [85, 86] and SU(2)L × U(1)Y × U(1)R [87]. [78, 81] to find suitable benchmark points, i.e. a low energy input for the MSSM singlet fermion sector and for the lepton-number violating soft SUSY-breaking sector while a top-down. For μS ∼ O(keV), we can bring down MR to O(TeV) range even with comparatively large Dirac Yukawa couplings of O(0.1), leading to a rich collider phenomenology [78, 93,94,95,96] as well as observable lepton flavor violation (LFV) effects [82, 97,98,99,100,101,102,103,104,105,106,107]
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