Complete helicity decomposition of the $\gamma^*/Z^*t\bar{t}$ vertex including higher order QCD corrections and applications to $e^+e^-\rightarrow t \bar t$

B. Lampe

doi:doi:10.1007/s100529901098

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2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C 8, 447-456
DOI 10.1007/s100529901098

Complete helicity decomposition of the $\gamma^/Z^t\bar{t}$ vertex including higher order QCD corrections and applications to $e^+e^-\rightarrow t \bar t$

B. Lampe

Max Planck Institut für Physik, Föhringer Ring 6, D-80805 München, Germany

Received: 12 October 1998 / Revised version: 29 November 1998 / Published online: 11 March 1999

Abstract
The complete density matrix for all polarization configurations in the process $\gamma^*/Z^* \rightarrow t\bar t$ ,where $\gamma^*/Z^*$ is an off-shell photon or Z boson and t is the top quark, is calculated numerically including oneloop QCD corrections, i.e. virtual and real gluon contributions in $O(\alpha_s)$ .The analysis is done in the framework of the helicity formalism. The results are particularly suited for top quark production at the Linear Collider, but may be useful in other circumstances as well. Relations to LEP and Tevatron physics are pointed out.