A 95 GeV Higgs Boson in the Georgi-Machacek Model

Abstract

CMS and ATLAS have reported small excesses in the search for low-mass Higgs bosons in the di-photon decay channel at exactly the same mass, $95.4$GeV. These searches rely on improved analysis techniques, enhancing in particular the discrimination against the $Z\to e^{+}{e}^{-}$ background. In models beyond the Standard Model (SM) that extend the Higgs sector with triplets, doubly-charged Higgs bosons are predicted which can contribute substantially to the di-photon decay rate of a light Higgs boson. The Georgi-Machacek (GM) Model is of particular interest in this context, since despite containing Higgs triplets it preserves the electroweak $\rho$-parameter to be 1 at the tree level. We show that within the GM model, a Higgs boson with a mass of $\sim 95$GeV with a di-photon decay rate as observed by CMS and ATLAS can be well described. We discuss the di-photon excess in conjunction with an excess in the $b\bar{b}$ final state observed at LEP and an excess observed by CMS in the di-tau final state, which have been found at comparable masses with local significances of about $2\sigma$ and $3\sigma$, respectively. The presence of a Higgs boson at about $95$GeV within the GM model would imply good prospects of the searches for additional light Higgs bosons. In particular, the observed excess in the di-photon channel would be expected to be correlated in the GM model with a light doubly-charged Higgs boson in the mass range between $100$GeV and $200$GeV, which motivates dedicated searches in upcoming LHC Runs.

26 pages, 7 figures, 1 table, matches the published version

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