CP-violating Zγγ and top-quark electric dipole couplings in

1998/09/30 by P. Poulose, Saurabh D. Rindani · 2 citations
Medicine · Physics and Astronomy · #Atomic and Subatomic Physics Research #Medical Imaging Techniques and Applications #Particle physics theoretical and experimental studies #hep-ph

paper · pdf · doi:10.1016/s0370-2693(99)00236-1

published as Phys.Lett. B452 (1999) 347-354 · 10 pages, latex, two figures included, Version accepted for publication in PLB

arxiv created 1999/02/17 · openalex publication_date 1999/04/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

An effective anomalous CP-violating Z-gamma-gamma coupling can give rise to observable CP-odd effects in gamma gamma -> t bart. We study certain asymmetries in the decay lepton distributions in gamma gamma -> t bart arising from top decay in the presence of a CP-violating Z-gamma-gamma coupling as well as a top-quark electric dipole coupling. We find that a photon linear collider with geometric luminosity of 20 fb^-1 can put limits of the order of 0.1 on the imaginary part of the CP-violating anomalous Z-gamma-gamma coupling using these asymmetries.

Cited by

• Lepton distribution as a probe of new physics in production and decay of thetquark and its polarization
• Probing electroweak top quark couplings at hadron colliders