Top-quark production in hadron-hadron collisions and anomalous top-quark{endash}gluon couplings

Journal Article · Wed May 01 04:00:00 EDT 1996 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.53.4875· OSTI ID:284051

Haberl, P; Nachtmann, O; Wilch, A ^[1]

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1. Institut fuer Theoretische Physik, Universitaet Heidelberg, Philosophenweg 16, D-69120 Heidelberg (Federal Republic of Germany)

We discuss the influence of anomalous {ital t{bar t}G} couplings on total and differential {ital t{bar t}} production cross sections in hadron-hadron collisions. We study in detail the effects of a chromoelectric and a chromomagnetic dipole moment {ital d}{sub {ital t}}{sup {prime}} and {mu}{sub {ital t}}{sup {prime}} of the top quark. We estimate the values of {ital d}{sub {ital t}}{sup {prime}} and {mu}{sub {ital t}}{sup {prime}} which are allowed by the present Fermilab Tevatron experimental results on top-quark production in {ital p{bar p}} collisions. In the {mu}{sub {ital t}}{sup {prime}}-{ital d}{sub {ital t}}{sup {prime}} 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 {ital CP} invariance. We discuss a {ital CP}-odd observable {cflx {ital O}}{sub {ital L}} which allows for a direct search for {ital CP} violation in top-quark production. We find that the presence of a chromomagnetic moment {mu}{sub {ital t}}{sup {prime}} can influence the sensitivity of {cflx {ital O}}{sub {ital L}} to {ital d}{sub {ital t}}{sup {prime}} considerably. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 284051
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 9 Vol. 53; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CP INVARIANCE
DIFFERENTIAL CROSS SECTIONS
DIPOLE MOMENTS
FERMILAB TEVATRON
HADRON-HADRON INTERACTIONS
PARTICLE PRODUCTION
PROTON-ANTIPROTON INTERACTIONS
T QUARKS
TOPONIUM
VIOLATIONS