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Sensitivity to single vectorlike bottom quark production at 3 TeV CLIC

R. Benbrik1,*, M. Berrouj1,†, M. Boukidi2,‡, M. Ech-chaouy1,§, K. Kahime3,∥, and K. Salime1,¶

  • *Contact author: r.benbrik@uca.ac.ma
  • †Contact author: mbark.berrouj@ced.uca.ma
  • ‡Contact author: mohammed.boukidi@ifj.edu.pl
  • §Contact author: m.echchaouy.ced@uca.ma
  • ∥Contact author: Kahimek@gmail.com
  • Contact author: k.salime.ced@uca.ma
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Phys. Rev. D 114, 053006 – Published 15 September, 2026

DOI: https://doi.org/10.1103/hq19-dn7s

Abstract

We study the sensitivity of the Compact Linear Collider at s=3  TeV to the single electroweak production of a vectorlike bottom quark in a type II two-Higgs-doublet model extended by vectorlike quarks. We consider the process e+e−→Bb¯+B¯b, followed by B→ϕb with ϕ=H, A and ϕ→tt¯. We focus on the semileptonic final state with one charged lepton, missing transverse momentum, four b-tagged jets, and two light jets. This channel directly probes the interplay between the extended quark and Higgs sectors. After applying theoretical constraints, electroweak precision constraints, Higgs-sector bounds, and current collider limits, we perform detector-level cut-based and multivariate analyses. The cut-based analysis remains below discovery sensitivity at 5  ab−1, while a multilayer perceptron and an xgboost classifier provide substantially improved signal-background separation. For viable scenarios with mB≃1.3–1.5  TeV, the expected significance remains above 5σ even for a 15% uncertainty on the background normalization.

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Phys. Rev. D 114, 053006– Published 15 September, 2026
  • Received 24 April 2026
  • Accepted 14 August 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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