Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 12: Search for New Particles I

T 12.8: Talk

Monday, March 15, 2021, 17:50–18:05, Tl

Search for off-shell ALPs in ATLAS — •Vincent Goumarre — Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany

An Axion Like Particle (ALP) is a Dark Matter candidate, but its expected small mass makes it difficult to detect in resonance searches at the LHC. However, it is possible to search for ALPs as off-shell mediators in s-channel processes (Phys. Rev. Lett. 124, 051802 (2020)). We report results based on ATLAS measurements of differential cross-section of pp->Zγ and pp->WW production. This study leads to new constraints on the allowed parameter space in the context of an effective field theory model for ALPs with mass smaller than 100 GeV.