Experimental HEP Seminar

Probing Electroweak Top Quark Couplings at Hadron Colliders

Uli Baur

SUNY Buffalo

I consider QCD t-t-γ and t-t-Z production at hadron colliders as a tool to measure the ttγ and ttZ couplings. At the Tevatron it may be possible to perform a first, albeit not very precise, test of the ttγ vector and axial vector couplings in t-t-γ production, provided that more than 5 fb^-1 of integrated luminosity are accumulated. At the CERN Large Hadron Collider it will be possible to probe the ttγ couplings at the few percent level, which approaches the precision which one hopes to achieve with a next-generation e⁺e^- linear collider. For an integrated luminosity of 300 fb^-1, the ttZ vector (axial vector) coupling can be determined with an uncertainty of 45-85% (15-20%), whereas the dimension-five dipole form factors can be measured with a precision of 50-55%.