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Bounds on invisible Higgs boson decays extracted from LHC ttH production data.

  • Author(s): Zhou, Ning
  • Khechadoorian, Zepyoor
  • Whiteson, Daniel
  • Tait, Tim MP
  • et al.

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We present an upper bound on the branching fraction of the Higgs boson to invisible particles by recasting a CMS Collaboration search for stop quarks decaying to tt + E(T)(miss). The observed (expected) bound, BF(H → inv.) < 0.40(0.65) at 95% C.L., is the strongest direct limit to date, benefiting from a downward fluctuation in the CMS data in that channel. In addition, we combine this new constraint with existing published constraints to give an observed (expected) bound of BF(H → inv.) < 0.40(0.40) at 95% C.L., and we show some of the implications for theories of dark matter which communicate through the Higgs portal.

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