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Phys. Rev. D 62, 055005 (2000) [4 pages]

Reexamination of the constraint on top-color-assisted technicolor models from Rb

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Chongxing Yue1,2, Yu-Ping Kuang1,3, Xue-Lei Wang1,3,2, and Weibin Li2,*
1CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, People’s Republic of China
2Department of Physics, Henan Normal University, Xinxiang 453002, People’s Republic of China
3Department of Physics, Tsinghua University, Beijing 100084, People’s Republic of China

Received 14 January 2000; published 26 July 2000

Recent study on the charged top-pion correction to Rb shows that it is negative and large, so that the precision experimental value of Rb gives rise to a severe constraint on the top-color-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 Rb, the constraint on the top-color-assisted technicolor models from Rb changes significantly. The top-pion mass is allowed to be in the region of a few hundred GeV depending on the models.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.62.055005
DOI:
10.1103/PhysRevD.62.055005
PACS:
12.60.Cn, 12.60.Nz, 13.38.Dg

*Mailing address.

 
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