Search for single production of a vectorlike; ; ; B; ′; ; ; quark decaying to a top quark and a; ; W; ; boson in the single-lepton final state in proton-proton collisions at; ; ; s; ; =; 13;  ;  ; TeV; Journal Article uri icon

Overview

abstract

  • ; A search is presented for the production of a single narrow-width vectorlike; ; ; B; ′; ; ; quark that decays to a; ; ; t; ; ; quark and a; ; ; W; ; ; boson. This search targets a single-lepton final state, where a muon or electron originates either from the semileptonic decay of the; ; ; t; ; ; quark or from the leptonic decay of the; ; ; W; ; ; boson, with the other particle decaying hadronically. The (semi)leptonic portion of the event is reconstructed from an electron or muon, missing transverse momentum, and a small-radius jet identified as a; ; ; b; ; ; quark jet if the muon or electron originates from the; ; ; t; ; ; quark. The hadronic portion of the event is reconstructed as a single large-radius jet. The originating particle of the large-radius jet is identified using a neural-network-based tagger, and the dominant background contributions are modeled from data using a neural autoregressive flow network. The data were collected from 2016 to 2018 by the CMS experiment at the LHC in proton-proton collisions at; ; ; ; ; s; ; ; =; 13;  ;  ; TeV; ; ; , corresponding to an integrated luminosity of; ; ; 138;  ;  ; ; ; fb; ; ; −; 1; ; ; ; ; . This search is the most sensitive to date to the production of single narrow-width; ; ; B; ′; ; ; quarks. It excludes electroweak-singlet; ; ; B; ′; ; ; quarks with; ; ; Γ; /; ; ; m; ; ; ; ; B; ; ; ′; ; ; ; ; =; 5; %; ; ; for masses between 0.8 and 1.23 TeV. Limits are also placed on the production cross section of single; ; ; B; ′; ; ; quarks produced in association with; ; ; t; ; ; quarks, and on the coupling factor of the; ; ; B; ′; ; ; quark to electroweak bosons.;

publication date

  • October 8, 2026

Date in CU Experts

  • October 28, 2026 6:41 AM

Full Author List

  • Tauqeer K; Gevorgyan A; Hayrapetyan A; Makarenko V; Tumasyan A; Adam W; Benato L; Bergauer T; Dragicevic M; Gundacker S

author count

  • 2554

Other Profiles

International Standard Serial Number (ISSN)

  • 2470-0010

Electronic International Standard Serial Number (EISSN)

  • 2470-0029

Additional Document Info

volume

  • 114

issue

  • 7

number

  • 072004