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

ATLAS Collaboration, S. Alderweireldt, J.F. Allen, T.M. Carter, P. J. Clark, J.R. Curran, D. Duda, S. M. Farrington, Y. Gao, J.M. Gargan, R.Y. Gonzalez Andana, C. Jiang, C. Leonidopoulos, M. Firdaus M. Soberi, V. J. Martin, L. Mijović, V.A. Parrish, E.A. Pender, T. Qiu, J.M. SilvaN. Themistokleous, E.M. Villhauer, B.M. Wynne, Z. Xu, E. Zaid

Research output: Contribution to journal β€Ί Article β€Ί peer-review

Abstract

A search is presented for the pair production of heavy vectorlike quarks (VLQs) that each decay into a π‘Š boson and a light quark. This study focuses on events where one π‘Š boson decays into leptons and the other into hadrons. The search analyzed 140  fbβˆ’1 of 𝑝⁒𝑝 collision data with βˆšπ‘  =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 π‘Š 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% confidence level for the branching ratio ℬ⁑(𝑄 β†’π‘Šβ’π‘ž) =1, an improvement of 840 GeV on the previous ATLAS limit.
Original languageEnglish
Article number052009
Pages (from-to)1-27
Number of pages27
JournalPhysical Review D
Volume110
Issue number5
DOIs
Publication statusPublished - 24 Sept 2024

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