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Title: Light signals from a lighter Higgs

Abstract

Here, 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 $$\gamma \gamma$$ below the SM Higgs mass, taking the recent $$2.9\, \sigma$$ (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 $$\gamma \gamma$$ branching ratio allows signals from $VH$+VBF production to yield $$\sigma \times BR_{\gamma\gamma} $$ comparable to total SM rates. Light $H$ production can be dominated via rare top decays $$t \rightarrow b H^+ \rightarrow b W^{*} H$$, 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 $$t\bar{t}h$$ searches at Tevatron and LHC. We find that with $$140\, \mathrm{GeV} < m_{H^+} < 160\, \mathrm{GeV}$$, $$\tan \beta \sim 5$$ and a coupling to gauge bosons of $$\sin^2 \delta \sim 0.1$$, such a scenario can produce all the excesses simultanously, where $tth$ arise from contamination from the rare top decays, as previously proposed. An implication of the Type-I scenario is that any $$\gamma \gamma$$ excess should be associated with additional elements that could reduce background, including $b$-jets, forward jets or signs of vector boson production.

Authors:
 [1];  [2]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. New York Univ. (NYU), New York, NY (United States); Flatiron Institute, New York, NY (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1463681
Report Number(s):
[FERMILAB-PUB-17-468-T; arXiv:1710.07649]
[Journal ID: ISSN 1029-8479; 1632004; TRN: US1902327]
Grant/Contract Number:  
[AC02-07CH11359]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
[Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 8]; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Higgs Physics

Citation Formats

Fox, Patrick J., and Weiner, Neal. Light signals from a lighter Higgs. United States: N. p., 2018. Web. doi:10.1007/JHEP08(2018)025.
Fox, Patrick J., & Weiner, Neal. Light signals from a lighter Higgs. United States. doi:10.1007/JHEP08(2018)025.
Fox, Patrick J., and Weiner, Neal. Tue . "Light signals from a lighter Higgs". United States. doi:10.1007/JHEP08(2018)025. https://www.osti.gov/servlets/purl/1463681.
@article{osti_1463681,
title = {Light signals from a lighter Higgs},
author = {Fox, Patrick J. and Weiner, Neal},
abstractNote = {Here, 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 $\gamma \gamma$ below the SM Higgs mass, taking the recent $2.9\, \sigma$ (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 $\gamma \gamma$ branching ratio allows signals from $VH$+VBF production to yield $\sigma \times BR_{\gamma\gamma} $ comparable to total SM rates. Light $H$ production can be dominated via rare top decays $t \rightarrow b H^+ \rightarrow b W^{*} H$, 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 $t\bar{t}h$ searches at Tevatron and LHC. We find that with $140\, \mathrm{GeV} < m_{H^+} < 160\, \mathrm{GeV}$, $\tan \beta \sim 5$ and a coupling to gauge bosons of $\sin^2 \delta \sim 0.1$, such a scenario can produce all the excesses simultanously, where $tth$ arise from contamination from the rare top decays, as previously proposed. An implication of the Type-I scenario is that any $\gamma \gamma$ excess should be associated with additional elements that could reduce background, including $b$-jets, forward jets or signs of vector boson production.},
doi = {10.1007/JHEP08(2018)025},
journal = {Journal of High Energy Physics (Online)},
number = [8],
volume = [2018],
place = {United States},
year = {2018},
month = {8}
}

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