Abstract
The production of top-quark pairs that subsequently decay hadronically and leptonically (lepton+jets channel) is one of the key processes for the study of top-quark properties at the LHC. In this article, NLO QCD corrections of order mathcal{O}left({alpha}_{mathrm{s}}^3{alpha}^4right) to the hadronic process mathrm{pp}to {mu}^{-}{overline{nu}}_{mu}mathrm{b}overline{mathrm{b}}mathrm{j}mathrm{j} are presented. The computation includes off-shell as well as non-resonant contributions, and experimental event selections are used in order to provide realistic predictions. The results are provided in the form of cross sections and differential distributions. The QCD corrections are sizeable and different from the ones of the fully leptonic channel. This is due to the different final state where here four jets are present at leading order.
Highlights
Contains only two strongly interacting particles in the final state
The QCD corrections are sizeable and different from the ones of the fully leptonic channel. This is due to the different final state where here four jets are present at leading order
The channel where one top quark decays hadronically while the other decays leptonically is investigated [19, 20]. It is dubbed lepton+jets channel, features a larger cross section, and has the advantage to allow for a better reconstruction of the event as only one neutrino contributes to the missing transverse energy
Summary
We consider the off-shell production of top-antitop pairs in the lepton+jets channel at the LHC, i.e. the hadronic process pp → μ−νμbbjj. These contributions are strongly suppressed, since they only arise in qqchannels and the O gs4g2 amplitude does not involve resonant top quarks and only one resonant W boson. The six partonic channels that feature two resonant top quarks approximate the LO fiducial cross section at the level of per mille (0.28%) for the set-up described in sections 4.1 and 4.2. The other channels, which can be constructed upon crossing one or two final state quarks in the initial state involve at most one top-quark and one W-boson resonance. They are further suppressed by a di-jet invariant-mass cut. All other photon-induced contributions at LO or NLO can only be a fraction of these because of PDF suppression, coupling suppression, and/or lacking resonance enhancement
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