A. Lux: The LHC as a q-μ Collider: A Search for Resonant Production of Leptoquarks

The Standard Model of Particle Physics is the current best understanding of fundamental particles, their properties, and interactions. Experiments at the Large Hadron Collider (LHC) are sensitive to new physics at the TeV scale. LHC experiments such as ATLAS (A Toroidal LHC ApparatuS) and CMS (Compact Muon Solenoid) have produced a wealth of high-quality measurements of observables predicted by the Standard Model but have not seen any evidence of phenomena beyond the Standard Model. However, anomalies seen in the muon magnetic moment at the g-2 experiment and in B-meson decays at LHCb and Belle could represent — should these anomalies persist in future experiments — the first hints at physics beyond the Standard Model. One possible explanation for these anomalies would be the existence of leptoquarks: hypothetical bosons that carry both lepton and baryon number. This talk will describe a search for leptoquarks decaying into a quark and a muon using LHC data recorded by the ATLAS detector from 2015 through 2023. This is the first ATLAS analysis that utilizes the resonant production mechanism of leptoquarks in proton-proton collisions. Resonant production involves the production of leptoquarks via the intrinsic lepton content of the proton. Expected exclusion limits based on Monte Carlo predictions are presented and shown to exceed current best limits from ATLAS and CMS.