Speaker
Description
Hidden-sector models provide a well-motivated framework for physics beyond the Standard Model, offering potential explanations for dark matter and other unresolved questions in particle physics. In a broad class of these models, particles produced at the Large Hadron Collider (LHC) may undergo complex showering and hadronization processes within a hidden strongly interacting sector. The resulting final states can contain a mixture of visible Standard Model particles and invisible dark-sector states, giving rise to a distinctive experimental signature known as semi-visible jets. Unlike conventional jets, semi-visible jets are characterized by a significant fraction of missing transverse momentum aligned with the jet direction, making them challenging to identify using standard search strategies. This talk reviews the theoretical motivation for semi-visible jets, their phenomenological properties, and the experimental techniques developed to distinguish them from Standard Model backgrounds. Recent results and future prospects for semi-visible jet searches at the LHC, including implications for dark-sector physics and upcoming analyses in the High-Luminosity LHC era, will also be discussed.