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Bound-state effects on kinematical distributions of top quarks at hadron colliders. (English) Zbl 1291.81398
Summary: First we present a theoretical framework to compute the fully differential cross sections for the top-quark productions and their subsequent decays at hadron colliders, incorporating the bound-state effects which are important in the \(t\bar{t}\) threshold region. We include the bound-state effects such that the cross sections are correct in the LO approximation both in the threshold and high-energy regions. Then, based on this framework we compute various kinematical distributions of top quarks as well as of their decay products at the LHC, by means of Monte-Carlo event-generation. These are compared with the corresponding predictions based on conventional perturbative QCD. In particular, we find a characteristic bound-state effect on the \(\left( bW^{+} \right) - \left( \bar{b}W^{-} \right)\) double-invariant-mass distribution, which is deformed to the lower invariant-mass side in a correlated manner.

81V05 Strong interaction, including quantum chromodynamics
81U05 \(2\)-body potential quantum scattering theory
81T15 Perturbative methods of renormalization applied to problems in quantum field theory
65C05 Monte Carlo methods
Full Text: DOI arXiv
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