Reexamination of the Constraint on Topcolor-Assisted Technicolor Models from R_b

Details Reexamination of the Constraint on Topcolor-Assisted Technicolor Models from R_b Reexamination of the Constraint on Topcolor-Assisted Technicolor Models from R_b

2000-01-14

arxiv.org/abs/hep-ph/0001133v2

Phys.Rev.D62:055005,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

6-page RevTex file using epsfig.sty for the insertion of the three figures. Discussion on the oblique correction parameter T i

Scientific paper

10.1103/PhysRevD.62.055005

Recent study on the charged top-pion correction to R_b shows that it is negative and large, so that the precision experimental value of R_b gives rise to a severe constraint on the topcolor-assisted technicolor models such that the top-pion mass should be of the order of 1 TeV. In this paper, we restudy this constraint by further taking account the extended technicolor gauge boson correction which is positive. With this positive contribution to R_b, the constraint on the topcolor-assisted technicolor models from R_b changes significantly. The top-pion mass is allowed to be in the region of a few hundred GeV depending on the models.

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