ar X iv : h ep - p h / 95 10 22 8 v 1 5 O ct 1 99 5 TMUP - HEL - 9505 UT - 720 October , 1995 A viable one - family technicolor model

ar X iv : h ep - p h / 95 11 36 4 v 1 1 7 N ov 1 99 5 TMUP - HEL - 9509

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 ≡ Γ b /Γ h from the standard-model prediction. However, generally the T parameter becomes unacceptably large. We show that in the one-family technico...

ar X iv : h ep - p h / 95 05 31 3 v 1 1 5 M ay 1 99 5 BUHEP - 95 - 18 Technipion contribution to b → sγ

We show that the present limit on the inclusive decay b → sγ provides strong constraints on Technicolor models. In particular, small values of F π and the mass of charged octet and singlet technipions are excluded, assuming the most natural form of the techni-pion coupling to the ordinary quarks.

ar X iv : h ep - p h / 95 10 33 7 v 1 1 8 O ct 1 99 5 BARI - TH / 95 - 217 Υ ( 4 S ) →

We give an estimate of the C-even B 0 ¯ B 0 background coming from the radia-tive decay Υ(4S) → B 0 ¯ B 0 γ at B-factories. Our result B(Υ(4S) → B 0 ¯ B 0 γ) ≃ 3× 10 −9 shows that such background could be safely neglected in the analyses of CP violating effects.

ar X iv : h ep - p h / 97 10 22 9 v 1 2 O ct 1 99 7 SLAC - PUB - 7663 October 1997 Z ′ INVESTIGATIONS AT FUTURE LEPTON

ar X iv : h ep - p h / 95 06 42 7 v 2 2 8 Ju n 19 95 Limits on Non - Commuting Extended Technicolor

Using precision electroweak data, we put limits on non-commuting extended technicolor models. We conclude that these models are viable only if the ETC-interactions are strong. Interestingly, these models predict a pattern of deviations from the standard model which can fit the data significantly better than the standard model does, even after taking into account the extra parameters involved.