Bounds on invisible Higgs boson decays extracted from LHC ttH production data.
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.
Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
Ning
N
Zhou
Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
Zepyoor
Z
Khechadoorian
Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
Daniel
D
Whiteson
Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
Tim M P
TM
Tait