CP-odd static electromagnetic properties of theWgauge boson and thetquark via the anomaloustbWcoupling

Abstract

In the framework of the electroweak chiral Lagrangian, the one-loop induced effects of the anomalous tbW coupling, which includes both left- and right-handed complex components, on the static electromagnetic properties of the W boson and the t quark are studied. The attention is focused mainly on the CP-violating electromagnetic properties. It is found that the tbW anomalous coupling can induce both CP-violating moments of the W boson, namely, its electric dipole ({mu}-tilde{sub W}) and magnetic quadrupole (Q-tilde{sub W}) moments. As far as the t quark is concerned, a potentially large electric dipole moment (d{sub t}) can arise due to the anomalous tbW coupling. The most recent bounds on the tbW coupling left- and right-handed parameters from B meson physics lead to the following estimates {mu}-tilde{sub W}{approx}4x10{sup -23}-4x10{sup -22} e{center_dot}cm and Q-tilde{sub W}{approx}10{sup -38}-10{sup -37} e{center_dot}cm{sup 2}, which are 7 and 14 orders of magnitude larger than the standard model (SM) predictions, whereas d{sub t} may be as large as 10{sup -22} e{center_dot}cm, which is about 8 orders of magnitude larger than its SM counterpart.