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Within the framework of a constrained Minimal Supersymmetric Standard Model(cMSSM) augmented by an MSSM singlet-pair sector to account for the non-zeroneutrino masses by inverse seesaw mechanism, the lightest supersymmetricparticle (LSP) can be a mixed sneutrino with mass as small as 50 GeV,satisfying all existing constraints, thus qualifying as a light dark mattercandidate. We study the possibility of the lightest neutral Higgs boson in thismodel decaying invisibly into a pair of sneutrino LSPs, thereby giving rise tonovel missing energy signatures at the LHC. We perform a two-parameter globalanalysis of the LHC Higgs data available till date to determine the optimalinvisible Higgs branching fraction in this scenario, and obtain a$2\sigma(1\sigma)$ upper limit of 0.23 (0.12). A detailed cut-based analysis iscarried out thereafter, demonstrating the viability of our proposed signalvis-a-vis backgrounds at the LHC.

Invisible Higgs Decay in a Supersymmetric Inverse Seesaw Model with Light Sneutrino Dark Matter