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arXiv · 2601.21040

Constraining dimension-6 SMEFT with higher-order predictions for $p p \to t W$

Nikolaos Kidonakis·Kaan Şimşek
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Abstract

We study single-top production in association with a $W$ boson at the Large Hadron Collider (LHC) as a probe of dimension-6 Standard Model effective field theory (SMEFT) at leading order, next-to-leading order, and approximate next-to-next-to-leading order accuracy in quantum chromodynamics (QCD). The process is sensitive to operators that modify the top-quark weak and chromomagnetic dipole interactions, and we perform three-parameter linear and quadratic SMEFT fits using doubly differential top-quark distributions in transverse momentum and rapidity for the Run II and Run III configurations at the LHC. We provide a detailed account of the uncertainties and quantify the impact of the different uncertainty components across bins and perturbative orders. We find that effective scales up to 2 TeV can be probed in nonmarginalized fits, while in marginalized fits the corresponding scales are around 0.5 and 1.5 TeV for linear and quadratic fits, respectively.

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Nikolaos Kidonakis, Kaan Şimşek. 2026-01-28. Constraining dimension-6 SMEFT with higher-order predictions for $p p \to t W$. https://doi.org/10.1103/6gpr-knw7

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