Possible explanation of Zbb vertex anomaly in one-family technicolor models

Details Possible explanation of Zbb vertex anomaly in one-family technicolor models Possible explanation of Zbb vertex anomaly in one-family technicolor models

1995-11-17

arxiv.org/abs/hep-ph/9511364v1

Phys.Rev. D54 (1996) 3594-3597

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages. REVTEX

Scientific paper

10.1103/PhysRevD.54.3594

In technicolor theories a large radiative correction to the Zbb vertex generally emerges, because of the large top quark mass and SU(2)_L gauge symmetry. The correction can give us an explanation for the deviation of the experimental value of R_b from the standard model prediction. However, generally the T parameter becomes unacceptably large. We show that in the one-family technicolor model recently proposed by the authors all the S, T, and U parameters can be consistent with the experimental bounds while the observed anomaly of R_b is naturally explained.

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