Top quark production near threshold and the top quark mass

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...

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 mass determination near tt̄ threshold at lepton colliders ∗

Top quark mass determination near t ¯ t threshold at lepton colliders * Abstract Future e + e − linear colliders will enable us to determine the top quark mass with high accuracy from the measurement of the 1S peak position of (remnant of) toponium. The estimated statistical error in this measurement is about 50 MeV with integrated luminosity of 30 fb −1. We calculate O(α 5 s m) corrections to ...

Renormalization-group improved calculation of top-quark production near threshold.

The top-quark cross section close to threshold in e(+)e(-) annihilation is computed including the summation of logarithms of the velocity at next-to-next-to-leading-logarithmic order in QCD. The remaining theoretical uncertainty in the normalization of the total cross section is at the few-percent level, an order of magnitude smaller than in previous next-to-next-to-leading order calculations. ...

Top Quark Pair Production In ... Annihilation Near Threshold