Projected sensitivity for non-resonant production of vector leptoquarks and single production of vector-like $T$ quarks in final states with b-jets with the ATLAS experiment at the HL-LHC

ATLAS Collaboration

Report

PUBDB-2025-04912

Projected sensitivity for non-resonant production of vector leptoquarks and single production of vector-like $T$ quarks in final states with b-jets with the ATLAS experiment at the HL-LHC

ATLAS Collaboration (Collaboration author)DESY*

2025

14 pp. (2025) [10.3204/PUBDB-2025-04912]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-04912

Report No.: ATL-PHYS-PUB-2025-040

Abstract: Projected sensitivity for $t$-channel vector leptoquark in final states with $b$-jets, and single-production vector-like $T$ quark (VLT) decaying to $W(\ell \nu)b$, using the ATLAS experiment at the High Luminosity LHC (HL-LHC) is presented: obtained from the extrapolation of analyses from the Run~2 dataset, using 140~$\mathrm{fb^{-1}}$ of data at $\sqrt{s} = 13$~TeV. Two scenarios for the systematic uncertainties are taken into account. The baseline scenario assumes that the systematic uncertainties are reduced by taking into account the increased amount of data, while the Run~2 scenario assumes the same systematic uncertainties as used in the Run~2 analysis. For the leptoquark, the expected limit on $\beta$ using baseline (Run~2) scenario of systematic uncertainty improves about 30% (20%) and 40% (20%) for the case of 3~$\mathrm{ab^{-1}}$ and 6~$\mathrm{ab^{-1}}$, respectively. For the VLT at 3~$\mathrm{ab^{-1}}$, the limit on $\kappa$ at a given mass improves significantly, being reduced by about 30% at 1.2~TeV up to about 60% at 2.3~TeV, with only modest additional gains achievable through further improvements in systematics or the use of the full 6~$\mathrm{ab^{-1}}$ dataset. The range of masses that can be studied within the constraints of the narrow-width approximation is extended from 2.3~TeV to over 2.7~TeV.

Keyword(s): HL-LHC ; Leptoquark ; Vector-like quark ; EXOTICS

Note: All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PUBNOTES/ATL-PHYS-PUB-2025-040. The authors list may be incomplete!

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