CP-odd WWZ couplings induced by vector-like quarks |
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| Authors: | E. Asakawa M. Marui N. Oshimo T. Saito A. Sugamoto |
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| Affiliation: | (1) Department of Physics and Graduate School of Humanities and Sciences, Ochanomizu University, Otsuka 2-1-1, Bunkyo-ku, Tokyo 112-8610, Japan , JP;(2) Faculty of Social Information Science, Kure University, Gouhara 2411-26, Kure, Hiroshima 724-0792, Japan , JP;(3) Institute for Cosmic Ray Research, University of Tokyo, Midori-cho 3-2-1, Tanashi, Tokyo 188-8502, Japan , JP |
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| Abstract: | A minimal extension of the standard model includes extra quarks with charges 2/3 and/or , 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 . Such magnitudes are larger than those predicted in the standard model, though smaller than those in certain other models. Received: 26 February 1999 / Published oinline: 12 August 1999 |
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