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Light scalar production from Higgs bosons and FASER 2

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arxiv 1908.04635 v2 pith:O56WD3S6 submitted 2019-08-13 hep-ph hep-ex

Light scalar production from Higgs bosons and FASER 2

classification hep-ph hep-ex
keywords higgsfaserinteractionbosonsquarticscalarallowanalyze
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 interaction is only loosely constrained by invisible Higgs decays. Given current experimental limits about $10\%$ of all Higgs bosons created at the LHC can be converted to new scalars with the mass up to $m_{\rm Higgs}/2$. This can significantly extend 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 to explore an orders-of-magnitude wider part of the Higgs portal's parameter space.

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