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 e +e - 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 % (near threshold and above 1TeV). We focus, in particular, on two scenarios: one close to threshold (365GeV), dominated by top-pair production, and one at the TeV scale (1.5TeV), for which irreducible-background contributions become relevant. An assessment of polarised-beam effects is also provided.
Denner, A., Pellen, M., Pelliccioli, G. (2023). NLO QCD corrections to off-shell top–antitop production with semi-leptonic decays at lepton colliders. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 83(5) [10.1140/epjc/s10052-023-11500-3].
NLO QCD corrections to off-shell top–antitop production with semi-leptonic decays at lepton colliders
Pelliccioli G.
2023
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 e +e - 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 % (near threshold and above 1TeV). We focus, in particular, on two scenarios: one close to threshold (365GeV), dominated by top-pair production, and one at the TeV scale (1.5TeV), for which irreducible-background contributions become relevant. An assessment of polarised-beam effects is also provided.File | Dimensione | Formato | |
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