2019 Impact factor 4.389
Particles and Fields
Eur. Phys. J. C 10, 327-330
DOI 10.1007/s100529900117

CP-odd WWZ couplings induced by vector-like quarks

E. Asakawa1 - M. Marui2 - N. Oshimo3 - T. Saito1 - A. Sugamoto1

1 Department of Physics and Graduate School of Humanities and Sciences, Ochanomizu University, Otsuka 2-1-1,
Bunkyo-ku, Tokyo 112-8610, Japan
2 Faculty of Social Information Science, Kure University, Gouhara 2411-26, Kure, Hiroshima 724-0792, Japan
3 Institute for Cosmic Ray Research, University of Tokyo, Midori-cho 3-2-1, Tanashi, Tokyo 188-8502, Japan

Received: 26 February 1999 / Published oinline: 12 August 1999

Abstract
A minimal extension of the standard model includes extra quarks with charges 2/3 and/or -1/3, whose left-handed and right-handed components are both SU(2) singlets. This model predicts new interactions of the flavor-changing neutral current at the tree level, which also violate CP invariance. We study CP-odd anomalous couplings for the W, W, and Z gauge bosons induced by the new interactions at the one-loop level. These couplings become non-negligible only if both up-type and down-type extra quarks are incorporated. Their form factors are estimated to be maximally of order 10-5. Such magnitudes are larger than those predicted in the standard model, though smaller than those in certain other models.


Copyright Springer-Verlag