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Off-shell single-top-quark production in the Standard Model Effective Field Theory
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We present a fully differential and spin-dependent $t$-channel single-top-quark calculation at next-to-leading order (NLO) in QCD including off-shell effects by using the complex mass scheme in the Standard Model (SM) and in the Standard Model Effective Field Theory (SMEFT). We include all relevant SMEFT operators at $1/\Lambda^2$ that contribute at NLO in QCD for a fully consistent comparison to the SM at NLO. In addition, we include chirality flipping operators that do not interfere with the SM amplitude and contribute only at $1/\Lambda^4$ with a massless $b$-quark. Such higher order effects are usually captured by considering anomalous right-handed $Wtb$ and left-handed $Wtb$ tensor couplings. Despite their formal suppression in the SMEFT, they describe an important class of models for new physics. Our calculation and analysis framework is publicly available in MCFM.
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Forward citations
Cited by 3 Pith papers
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A New Timing Signature of Black Hole Spin: Time-Delay Asymmetry in Kerr Accretion Flows
A mirror-paired asymmetry in photon arrival times from opposite sides of the projected spin axis provides a direct general-relativistic timing signature of black hole spin.
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SMEFT everywhere: a NLO study of $\boldsymbol{pp \to t\bar{t}H}$ with decaying tops
NLO QCD corrections to pp to ttbar H in the di-lepton channel with SMEFT operators included in both production and top-quark decays.
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A New Timing Signature of Black Hole Spin: Time-Delay Asymmetry in Kerr Accretion Flows
A mirror-paired time-delay asymmetry At vanishes for non-spinning black holes but is nonzero and increases with spin for Kerr black holes, depending on inclination and emission radius.
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