Speaker
Description
The "4321" renormalizable model proposes a mechanism that accommodates the experimental anomalies found in B-meson decays while remaining consistent with all other indirect flavor and electroweak precision measurements. Among the fundamental particles provided by the 4321 model are three families of Vector-Like Leptons (VLLs), with a mass predicted to be around 1 TeV. Using the full dataset corresponding to 140 fb-1 of integrated luminosity collected by the ATLAS detector in 13 TeV pp collisions at the LHC, a search is presented for VLL pairs as predicted by the "4321" model in regions containing hadronically decaying tau-leptons and no light-leptons in the final state. Signal-like events are selected with exactly one or two hadronically decaying tau-lepton candidates, no light-leptons, and least three jets identified as b-tagged. The expected sensitivity of the search is reported as 95% CL limit on the VLL production cross-section as a function of VLL mass.
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