Top Quark Confirmed

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 decays into heavy quark mesons.

For top quark decays into heavy quark mesons Υ and B̄ c , a complete calculation to the leading order both in QCD coupling constant αs and in v, the typical velocity of the heavy quarks inside the mesons, is performed. Relatons between the top quark mass and the decay branching ratios are studied. Comparion with the results which are obtained by using the quark frangmentation functions is also d...

Top Quark Physics: Summary

This talk summarizes recent progress in top quark physics studies for high energy linear electron-positron colliders as presented at the LCWS2000 Workshop at Fermilab. New results were presented for top pair production at threshold and in the continuum, as well as for top production at γγ colliders.

– 1– the Top Quark

A. Introduction: The top quark is the Q = 2/3, T3 = +1/2 member of the weak-isospin doublet containing the bottom quark (see the review on the “Standard Model of Electroweak Interactions” for more information). This note summarizes the properties of the top quark (mass, production cross section, decay branching ratios, etc.), and provides a discussion of the experimental and theoretical issues ...

Top Quark Physics ∗