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• W4292493670 abstract "In this work we explore the intriguing connections between searches for long-lived particles (LLPs) at the LHC and early universe cosmology. We study the non-thermal production of ultra-relativistic particles (i.e. dark radiation) in the early universe via the decay of weak-scale LLPs and show that the cosmologically interesting range $Delta N_text{eff} sim 0.01-0.1$ corresponds to LLP decay lengths in the mm to cm range. These decay lengths lie at the boundary between prompt and displaced signatures at the LHC and can be comprehensively explored by combining searches for both. To illustrate this point, we consider a scenario where the LLP decays into a charged lepton and a (nearly) massless invisible particle. By reinterpreting searches for promptly decaying sleptons and for displaced leptons at both ATLAS and CMS we can then directly compare LHC exclusions with cosmological observables. We find that the CMB-S4 target value of $Delta N_text{eff}=0.06$ is already excluded by current LHC searches and even smaller values can be probed for LLP masses at the electroweak scale." @default.
• W4292493670 created "2022-08-21" @default.
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• W4292493670 date "2022-08-18" @default.
• W4292493670 modified "2023-10-03" @default.
• W4292493670 title "Searching for dark radiation at the LHC" @default.
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• W4292493670 doi "https://doi.org/10.1007/jhep08(2022)169" @default.
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