Extended technicolor contribution to the Zbb vertex

Details Extended technicolor contribution to the Zbb vertex Extended technicolor contribution to the Zbb vertex

1995-10-18

arxiv.org/abs/hep-ph/9510334v1

Prog.Theor.Phys.Suppl.123:97-104,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages. Postscript file (uuencoded Z-compressed .tar file created by csh script uufiles.) Proceedings of the talk given at Yu

Scientific paper

10.1143/PTPS.123.97

The deviation of the experimental value of $R_b \equiv \Gamma_b/\Gamma_h$ from the standard-model prediction can be naturally explained in the extended technicolor scenario.The diagonal extended technicolor gauge boson which flavor-diagonally couples with both the ordinary fermions and the techni-fermions plays an important role in order to have the appropriate radiative correction to the $Zbb$ vertex. But since the diagonal extended technicolor gauge boson gives too large positive contribution to the $T$ parameter, we need some new mechanisms which generate negative contribution to the $T$ parameter.

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