ATLAS observes an excess over 8 sigma in ttbar production near threshold, consistent with NRQCD color-singlet S-wave quasi-bound states, with measured cross-section 9.3^{+1.4}_{-1.3} pb.
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Complete NLO QCD plus EW corrections are calculated for off-shell ttbar production in the lepton-plus-jets channel, including all doubly, singly and non-resonant diagrams with their interferences.
Non-factorisable two-loop EW virtual corrections to single-resonant processes reduce to an iteration of the one-loop result plus a new light-fermion contribution in dimensional regularization and are specific to single-resonance exchange.
Near-threshold top-quark pair production cross section at 13 TeV LHC is 11.67 pb with +1.43/-1.47 pb uncertainty, including NRQCD Green's function effects and comparison to POWHEG-BOX.
citing papers explorer
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Observation of a cross-section enhancement near the $t\bar{t}$ production threshold in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
ATLAS observes an excess over 8 sigma in ttbar production near threshold, consistent with NRQCD color-singlet S-wave quasi-bound states, with measured cross-section 9.3^{+1.4}_{-1.3} pb.
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Complete NLO corrections to off-shell $\boldsymbol{t\bar{t}}$ production in the $\boldsymbol{\ell+j}$ decay channel
Complete NLO QCD plus EW corrections are calculated for off-shell ttbar production in the lepton-plus-jets channel, including all doubly, singly and non-resonant diagrams with their interferences.
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Non-factorisable electroweak virtual corrections to single-resonant processes
Non-factorisable two-loop EW virtual corrections to single-resonant processes reduce to an iteration of the one-loop result plus a new light-fermion contribution in dimensional regularization and are specific to single-resonance exchange.
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Threshold Top-Quark Pair-Production: Cross Sections and Key Uncertainties
Near-threshold top-quark pair production cross section at 13 TeV LHC is 11.67 pb with +1.43/-1.47 pb uncertainty, including NRQCD Green's function effects and comparison to POWHEG-BOX.