Leptons lurking in semi-visible jets at the LHC
Cesare Cazzaniga, Annapaola de Cosa

TL;DR
This paper proposes a novel search strategy at the LHC for semi-visible jets originating from confining dark sectors, focusing on non-isolated lepton pairs within jets to detect potential dark matter signatures.
Contribution
It introduces a model-independent search method for semi-visible jets with leptonic signatures, enhancing detection sensitivity for dark sector particles at the LHC.
Findings
Potential to observe 3σ evidence of mediators up to 3.5 TeV.
Exclusion limits extend to 4.5 TeV for certain models.
Lepton pair invariant mass analysis can reach 5σ discovery at 3.5 TeV.
Abstract
This Letter proposes a new search for confining dark sectors at the Large Hadron Collider. As a result of the strong dynamics in the hidden sector, dark matter could manifest in proton-proton collisions at the Large Hadron Collider in form of hadronic jets containing stable invisible bound states. These semi-visible jets have been studied theoretically and experimentally in the fully hadronic signature where the unstable composite dark matter can only decay promptly back to Standard Model quarks. We present a simplified model based on two messenger fields separated by a large mass gap allowing dark bound states to decay into pairs of oppositely charged leptons. The resulting experimental signature is characterized by non-isolated lepton pairs inside semi-visible jets. We propose a search strategy independent from the underlying model assumptions targeting this new signature, and discuss…
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