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arXiv · 2604.19864

Low-Multiplicity Jets as Probes of GeV-Scale Light-Quark-Coupled Particles

Carlos Henrique de Lima·David McKeen·Maximilian Swiatlowski
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Abstract

We propose a search at the LHC for GeV-scale particles coupling predominantly to light quarks based on low-multiplicity jets. The search targets production in association with a hard photon and uses the feature that a light gauge-singlet can only decay into a small number of hadronic channels, yielding jets with anomalously low charged-track multiplicity and mass compared to QCD jets at the same transverse momentum. We determine the sensitivity to scalar and pseudoscalar couplings to up-quarks, and suggest a data-driven estimate that reduces the sensitivity to jet modeling uncertainties. This search extends the reach to hadronically-coupled particles into a previously inaccessible regime.

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Carlos Henrique de Lima, David McKeen, Maximilian Swiatlowski. 2026-04-21. Low-Multiplicity Jets as Probes of GeV-Scale Light-Quark-Coupled Particles. https://arxiv.org/abs/2604.19864

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