Abstract
The most general renormalizable interaction between the Higgs sector and a new gauge-singlet scalar S is governed by two interaction terms: cubic and quartic. The quartic term is only loosely constrained by invisible Higgs decays and given current experimental limits about 10% of all Higgs bosons at the LHC can be converted to new scalars with masses up to mHiggs/2. By including this production channel, one significantly extends the reach of the LHC-based Intensity Frontier experiments. We analyze the sensitivity of the FASER experiment to this model and discuss modest changes in the FASER 2 design that would allow exploring an order-of-magnitude wider part of the Higgs portal’s parameter space.
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Boiarska, I., Bondarenko, K., Boyarsky, A. et al. Light scalar production from Higgs bosons and FASER 2. J. High Energ. Phys. 2020, 49 (2020). https://doi.org/10.1007/JHEP05(2020)049
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DOI: https://doi.org/10.1007/JHEP05(2020)049