Probing exotic triple Higgs couplings at the LHC
Abstract
In extended Higgs sectors that exhibit alignment without decoupling, the additional scalars are allowed to have large couplings to the Standard Model Higgs. We show that current nonresonant diHiggs searches can be straightforwardly adapted to look for additional Higgses in these scenarios, where pair production of nonSM Higgses can be enhanced. For concreteness, we study pair production of exotic Higgses in the context of an almost inert two Higgs doublet model, where alignment is explained through an approximate $$\mathbb{Z}_2$$ symmetry under which the additional scalars are odd. In this context, the smallness of the $$\mathbb Z_2$$ violating parameter suppresses single production of exotic Higgses, but it does not prevent a sizeable trilinear coupling $hHH$ between the SM Higgs ($h$) and the additional states ($H$). We study the process $$pp\rightarrow h^* \rightarrow HH$$ in the final states of $$b\bar b b \bar b$$, $$b\bar b\gamma\gamma$$, and multileptons. We find that at the HLLHC these modes could be sensitive to masses of the additional neutral scalars in the range $$130\mbox{ GeV} \lesssim m_H \lesssim 290\mbox{ GeV}$$.
 Authors:

 Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
 Univ. de Tarapaca, Arica (Chile)
 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:
 1592138
 Report Number(s):
 arXiv:2001.00069; FERMILABPUB19640T
Journal ID: ISSN 10298479; oai:inspirehep.net:1773882; TRN: US2101844
 Grant/Contract Number:
 AC0207CH11359
 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: 2020; Journal Issue: 5; Journal ID: ISSN 10298479
 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
Gao, Christina, and Neill, Nicolás A. Probing exotic triple Higgs couplings at the LHC. United States: N. p., 2020.
Web. doi:10.1007/JHEP05(2020)087.
Gao, Christina, & Neill, Nicolás A. Probing exotic triple Higgs couplings at the LHC. United States. doi:https://doi.org/10.1007/JHEP05(2020)087
Gao, Christina, and Neill, Nicolás A. Tue .
"Probing exotic triple Higgs couplings at the LHC". United States. doi:https://doi.org/10.1007/JHEP05(2020)087. https://www.osti.gov/servlets/purl/1592138.
@article{osti_1592138,
title = {Probing exotic triple Higgs couplings at the LHC},
author = {Gao, Christina and Neill, Nicolás A.},
abstractNote = {In extended Higgs sectors that exhibit alignment without decoupling, the additional scalars are allowed to have large couplings to the Standard Model Higgs. We show that current nonresonant diHiggs searches can be straightforwardly adapted to look for additional Higgses in these scenarios, where pair production of nonSM Higgses can be enhanced. For concreteness, we study pair production of exotic Higgses in the context of an almost inert two Higgs doublet model, where alignment is explained through an approximate $\mathbb{Z}_2$ symmetry under which the additional scalars are odd. In this context, the smallness of the $\mathbb Z_2$ violating parameter suppresses single production of exotic Higgses, but it does not prevent a sizeable trilinear coupling $hHH$ between the SM Higgs ($h$) and the additional states ($H$). We study the process $pp\rightarrow h^* \rightarrow HH$ in the final states of $b\bar b b \bar b$, $b\bar b\gamma\gamma$, and multileptons. We find that at the HLLHC these modes could be sensitive to masses of the additional neutral scalars in the range $130\mbox{ GeV} \lesssim m_H \lesssim 290\mbox{ GeV}$.},
doi = {10.1007/JHEP05(2020)087},
journal = {Journal of High Energy Physics (Online)},
number = 5,
volume = 2020,
place = {United States},
year = {2020},
month = {5}
}
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