Search for pair-produced vector-like quarks coupling to light quarks in the lepton plus jets final state using 13 TeV $pp$ collisions with the ATLAS detector

Abstract

A search is presented for the pair-production of heavy vector-like quarks (VLQs) that each decay into a $W$ boson and a light quark. This study focuses on events where one $W$ boson decays into leptons and the other into hadrons. The search analyzed 140 fb${}^{-1}$ of $pp$ collision data with $\sqrt{s}=13$ TeV, recorded by the ATLAS detector from 2015 to 2018 during Run 2 of the Large Hadron Collider. The final state is characterized by a high-transverse-momentum isolated electron or muon, large missing transverse momentum, multiple small-radius jets, and a single large-radius jet identified as originating from the hadronic decay of a boosted $W$ boson. With higher center-of-mass energy and integrated luminosity than in the Run 1 search, and improved analysis tools, this analysis excludes VLQs ($Q$) with masses below 1530 GeV at 95% CL for the branching ratio $\mathcal{B}(Q\to Wq)=1$, an improvement of 840 GeV on the previous ATLAS limit.

41 pages in total, author list starting page 24, 6 figures, 4 tables, published in Phys. Rev. D 110 (2024) 052009. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2021-35/

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