Top-quark pair production close to threshold: Top-quark mass, width, and momentum distribution

Top Quark Pair Production close to Threshold: Top Mass, Width and Momentum Distribution

The complete NNLO QCD corrections to the total cross section σ(ee → Z∗, γ∗ → tt̄) in the kinematic region close to the top-antitop threshold are calculated by solving the corresponding Schrödinger equations exactly in momentum space in a consistent momentum cutoff regularization scheme. The corrections coming from the same NNLO QCD effects to the top quark three-momentum distribution dσ/d|~kt| a...

Top quark production near threshold and the top quark mass

We consider top-anti-top production near threshold in e+e− collisions, resumming Coulomb-enhanced corrections at next-to-next-to-leading order (NNLO). We also sum potentially large logarithms of the small top quark velocity at the next-toleading logarithmic level using the renormalization group. The NNLO correction to the cross section is large, and it leads to a significant modification of the...

Supersymmetric Correction to Top Quark Pair Production near Threshold

We studied the leading supersymmetric contribution to top-antitop threshold production using the NRQCD framework. The one-loop matching to the potential and the Wilson coefficient of the leading S1 production current were considered. We point out that the leading correction to the potential is zero due to SU(3)c gauge invariance. This is true in general for any new physics that enters above the...

Top quark production near threshold ∗

Only a few of the top quark’s properties are currently known. In the future the Tevatron and the LHC, and a Linear Collider, will measure many of its couplings in great detail. This will tell us whether the top quark is just another standard model quark (in which case it would be a rather uninteresting one) or whether it plays a special role in physics beyond the standard model, as perhaps its ...

Top Quark Pair Production In ... Annihilation Near Threshold