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  • Open Access

LHC-friendly freeze-in dark matter via the Higgs portal

Xinyue Yin1, Shuai Xu2, and Sibo Zheng1,*

  • *Contact author: sibozheng.zju@gmail.com

Phys. Rev. D 112, 035034 – Published 25 August, 2025

DOI: https://doi.org/10.1103/sc6v-9jct

Abstract

It is known that single-field freeze-in dark matter barely leaves footprints in dark matter direct detection and collider experiments. This situation can be altered in the two-field context. In this work we propose a two-field freeze-in dark matter model through the Higgs portal. The observed dark matter relic abundance is obtained by a decay of scalar mediator thermalized in the early Universe. While there is a lack of direct dark matter signals, the scalar mediator is in the reach of High Luminosity LHC either through the vector boson fusion or mono-Z channels. Within the allowed scalar mass window of 10–50 GeV, we use improved cuts to derive both 2σ exclusion and 5σ discovery limits, depending on the value of Higgs portal coupling. If verified, this scalar mediator signal allows us to infer the freeze-in dark matter.

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