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Status of invisible Higgs decays

Abstract : We analyze the extent to which the LHC and Tevatron results as of the end of 2012 constrain invisible (or undetected) decays of the Higgs boson-like state at ~ 125 GeV. To this end we perform global fits for several cases: 1) a Higgs boson with Standard Model (SM) couplings but additional invisible decay modes; 2) SM couplings to fermions and vector bosons, but allowing for additional new particles modifying the effective Higgs couplings to gluons and photons; 3) no new particles in the loops but tree-level Higgs couplings to the up-quarks, down-quarks and vector bosons, relative to the SM, treated as free parameters. We find that in the three cases invisible decay rates of 23%, 61%, 88%, respectively, are consistent with current data at 95% confidence level (CL). Limiting the coupling to vector bosons, CV, to CV < 1 in case 3) reduces the allowed invisible branching ratio to 56% at 95% CL. Requiring in addition that the Higgs couplings to quarks have the same sign as in the SM, an invisible rate of up to 36% is allowed at 95% CL. We also discuss direct probes of invisible Higgs decays, as well as the interplay with dark matter searches.
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Contributor : Emmanuelle Vernay <>
Submitted on : Tuesday, June 11, 2013 - 11:15:46 AM
Last modification on : Thursday, November 19, 2020 - 12:58:48 PM

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G. Belanger, B. Dumont, U. Ellwanger, J.F. Gunion, S. Kraml. Status of invisible Higgs decays. Physics Letters B, Elsevier, 2013, 723, pp.340-347. ⟨10.1016/j.physletb.2013.05.024⟩. ⟨in2p3-00831440⟩



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