期刊
PHYSICS LETTERS B
卷 723, 期 4-5, 页码 340-347出版社
ELSEVIER
DOI: 10.1016/j.physletb.2013.05.024
关键词
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资金
- US DOE [DE-FG03-91ER40674]
- IN2P3 under PICS FR-USA [5872]
- French ANR DMAstroLHC
- French ANR LFV-CPV-LHC
- ANR STR-COSMO
- European Union [PITN-GA-2011-289442]
- National Science Foundation [PHY-1066293, NSF PHY11-25915]
- INFN
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 similar to 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, C-V, to C-V <= 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. (C) 2013 Published by Elsevier B.V.
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