Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-03-19
Phys.Lett.B385:304-310,1996
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages LaTeX; 2 figures included as separate files in postscript format
Scientific paper
10.1016/0370-2693(96)00859-3
We discuss a model in which the third generation fermions undergo a different $SU(2)$ weak interaction from the first two generation fermions. In general, a flavor changing neutral current interaction is expected. Constrained by the precision low energy data, the mass ($M_{Z'}=M_{W'}$) of the heavy gauge bosons is bounded from below to be about $1.1$ TeV for $\alpha_s=0.125$ and about $1.3$ TeV for $\alpha_s=0.115$, at the $3\sigma$ level. This model favors a larger $R_b$ and a smaller $R_c$ as compared with the Standard Model, but it does not explain the $R_c$ data. If one takes the $R_b$ data seriously, then $M_{Z'}$ is bounded, at the $3\sigma$ level, to be $462$ GeV $< M_{Z^{\prime}} \cos\phi < 1481\,\, {\rm{GeV}}$, where $\cos\phi$ is the mixing angle between the two $SU(2)$'s in the model. Effects predicted for high energy experiments at the Tevatron, LEP140, LEP-II, LHC, and future linear colliders are also discussed.
Malkawi Ehab
Tait Tim
Yuan C.--P.
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