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- W4367842105 abstract "Abstract The study of top-quark properties will be a central aspect of the physics programme of any future lepton collider. In this article, we investigate the production of top-quark pairs in the semi-leptonic decay channel in $${textrm{e}}^{+}textrm{e}^{-}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mrow> <mml:mtext>e</mml:mtext> </mml:mrow> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mtext>e</mml:mtext> <mml:mo>-</mml:mo> </mml:msup> </mml:mrow> </mml:math> collisions, whose experimental signature is one charged lepton, jets, and missing energy. We present for the first time fiducial cross sections and differential distributions at next-to-leading-order accuracy in QCD for the full off-shell process. We find that the QCD corrections for the considered process are strongly dependent on the beam energies and range from few per cent up to more than $$100%$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>100</mml:mn> <mml:mo>%</mml:mo> </mml:mrow> </mml:math> (near threshold and above $$1,text {TeV} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>1</mml:mn> <mml:mspace /> <mml:mtext>TeV</mml:mtext> </mml:mrow> </mml:math> ). We focus, in particular, on two scenarios: one close to threshold ( $$365,text {GeV} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>365</mml:mn> <mml:mspace /> <mml:mtext>GeV</mml:mtext> </mml:mrow> </mml:math> ), dominated by top-pair production, and one at the TeV scale ( $$1.5,text {TeV} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>1.5</mml:mn> <mml:mspace /> <mml:mtext>TeV</mml:mtext> </mml:mrow> </mml:math> ), for which irreducible-background contributions become relevant. An assessment of polarised-beam effects is also provided." @default.
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- W4367842105 date "2023-05-03" @default.
- W4367842105 modified "2023-09-26" @default.
- W4367842105 title "NLO QCD corrections to off-shell top–antitop production with semi-leptonic decays at lepton colliders" @default.
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- W4367842105 doi "https://doi.org/10.1140/epjc/s10052-023-11500-3" @default.
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