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:
-
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- 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)
- 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. https://doi.org/10.1007/JHEP08(2018)025
Fox, Patrick J., and Weiner, Neal. Tue .
"Light signals from a lighter Higgs". United States. https://doi.org/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}
}
Web of Science
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