Constraining dimension-6 SMEFT with higher-order predictions for $p p \to t W$
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| Format: | Preprint |
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2026
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| _version_ | 1866911649678491648 |
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| author | Kidonakis, Nikolaos Şimşek, Kaan |
| author_facet | Kidonakis, Nikolaos Şimşek, Kaan |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_21040 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Constraining dimension-6 SMEFT with higher-order predictions for $p p \to t W$ Kidonakis, Nikolaos Şimşek, Kaan High Energy Physics - Phenomenology 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. |
| title | Constraining dimension-6 SMEFT with higher-order predictions for $p p \to t W$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2601.21040 |