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Light Signals from a Lighter Higgs
With the Higgs search program already quite mature, there is the exciting
possibility of discovering a new particle with rates near that of the SM Higgs.
We consider models with a signal in below the SM Higgs mass,
taking the recent (local) CMS excess at 95 GeV as a target. We
discuss singlet models with additional vectorlike matter, but argue that a
Type-I two Higgs doublet model provides a more economical scenario. In such a
setup, going into regions of moderate-to-strong fermiophobia, the enhanced
branching ratio allows signals from +VBF production to
yield comparable to total SM rates. Light
production can be dominated via rare top decays , which provides an alternate explanation of the excess.
We consider this in the context of other Higgs anomalies, namely the LEP Higgs
excess near the same mass, and excesses in searches at Tevatron and
LHC. We find that with ,
and a coupling to gauge bosons of ,
such a scenario can produce all the excesses simultanously, where arise
from contamination from the rare top decays, as previously proposed. An
implication of the Type-I scenario is that any excess should be
associated with additional elements that could reduce background, including
-jets, forward jets or signs of vector boson production.Comment: 15 pages, 3 figure
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