1995/05/31 by P. Haberl, Otto Nachtmann, O. Nachtmann +1 · 7 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.53.4875
published as Phys.Rev. D53 (1996) 4875-4885 · footnote pg. 4 changed, acknowledgments extended
arxiv created 1995/06/01 · openalex publication_date 1996/05/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We discuss the influence of anomalous tt\ifmmode\else\textasciimacron\fiG couplings on total and differential tt\ifmmode\else\textasciimacron\fi production cross sections in hadron-hadron collisions. We study in detail the effects of a chromoelectric and a chromomagnetic dipole moment dt^\ensuremath' and \mathrm\ensuremathμt^\ensuremath' of the top quark. We estimate the values of dt^\ensuremath' and \mathrm\ensuremathμt^\ensuremath' which are allowed by the present Fermilab Tevatron experimental results on top-quark production in pp\ifmmode\else\textasciimacron\fi collisions. In the \mathrm\ensuremathμt^\ensuremath'-dt^\ensuremath' plane, we find a whole region where the anomalous couplings give a zero net contribution to the total top-quark production rate. In differential cross sections, the anomalous moments have to be quite sizable to give measurable effects. A chromoelectric dipole moment of the top quark violates CP invariance. We discuss a CP-odd observable O^L which allows for a direct search for CP violation in top-quark production. We find that the presence of a chromomagnetic moment \mathrm\ensuremathμt^\ensuremath' can influence the sensitivity of O^L to dt^\ensuremath' considerably. \textcopyright 1996 The American Physical Society.