Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 37: Search for New Particles 2

T 37.3: Vortrag

Dienstag, 22. März 2022, 16:45–17:00, T-H22

Search for pair-produced leptoquarks decaying into quarks of the third and leptons of the first or second generation with the ATLAS experiment at √s=13TeV — •Volker Austrup and Frank Ellinghaus — Bergische Universität Wuppertal

Motivated by similarities between the quark and lepton sectors, leptoquarks (LQs) are hypothetical bosons assumed to couple to quarks and leptons at the same time. First proposed in the 1980s, the initial models included couplings only within one generation. However, hints at lepton flavor universality violation observed in several B meson decay experiments such as LHCb, BaBar, and Belle have sparked a renewed interest in LQ models, particularly extensions allowing couplings to quarks and leptons of different generations. These models introduce lepton flavor violating processes - strongly suppressed in the Standard Model - at tree level, thus modifying rare B meson decays. In this talk, a search for pair-produced scalar and vector LQs decaying into quarks of the third and leptons (neutral and charged) of the first or second generation is presented. The focus of the analysis is on final states with exactly one charged lepton and large amounts of missing transverse momentum. Neural networks are utilized to ensure good separation between signal and background processes across a wide range of the parameter space. Exclusion limits are presented, based on pp-collision data corresponding to 139 fb⁻¹ at a centre-of-mass energy of √s = 13 TeV collected by the ATLAS experiment at the LHC between 2015 and 2018.