Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 15: Searches/BSM I

T 15.5: Talk

Monday, March 16, 2026, 17:15–17:30, KH 02.018

Search for Delayed Long-Lived Particles in Consecutive Bunch Crossings using the ATLAS Detector — •Tobias Heintz — Kirchhoff Institute for Physics, Heidelberg, Germany

This contribution presents a novel strategy to detect long-lived particles (LLPs) that decay across two consecutive bunch crossings, combining missing transverse momentum from a slowly propagating LLP in one bunch crossing with a displaced jet that appears more than 25 ns later and is azimuthally correlated. Unconventional BSM scenarios would give rise to such a signature over multiple bunch crossings, but are not efficiently captured by conventional trigger and reconstruction approaches. The concept of a dedicated trigger and its implementation within the ATLAS detector are discussed, along with projected sensitivities for a benchmark scenario motivated by inelastic dipole dark matter.