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arXiv · 2604.09225

Constraining new physics in charm quark associated Higgs boson production events using the Standard Model effective field theory approach

Nordin Breugelmans·Felix Heyen·Jorgen D'Hondt·Michael Tytgat·Gerrit Van Onsem
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Abstract

As the search for observable deviations from the Standard Model of particle physics remains to be of significant interest, effective field theory (EFT) continues to be a popular method to parametrize such effects. In this work, a first-time investigation is performed of the unique capability of measurements of charm quark associated Higgs boson production (cH) in proton-proton collisions at the CERN Large Hadron Collider to constrain a set of dimension-six EFT operators. The phenomenology of these operators is discussed and a proposed analysis strategy is presented, with a focus on $\mathrm{H}\rightarrow \mathrm{Z}\mathrm{Z}^{*}\rightarrow 4μ$ decays, using a generic detector simulation that is parametrized to reflect the response of the CMS detector at the LHC. From this, expected 95% CL upper limits are derived for the Wilson coefficients of individual operators by considering yield and shape effects in the spectra of the four-muon invariant mass $m_{4μ}$ and leading jet transverse momentum $p_{T}$. Scenarios with simultaneous contributions from two operators are also considered. Finally, potential analysis improvements that may be implemented in an experimental context are outlined.

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Nordin Breugelmans, Felix Heyen, Jorgen D'Hondt, Michael Tytgat, Gerrit Van Onsem. 2026-04-10. Constraining new physics in charm quark associated Higgs boson production events using the Standard Model effective field theory approach. https://arxiv.org/abs/2604.09225

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