Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-02-25
Phys.Lett. B531 (2002) 237-244
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 2 figures, to appear in Physics Letters B
Scientific paper
10.1016/S0370-2693(02)01432-6
The contributions into radiative correction parameters S, T, U from scalar leptoquark and scalar gluon doublets are investigated in the minimal four color symmetry model. It is shown that the current experimental data on S, T, U allow the scalar leptoquarks and the scalar gluons to be relatively light (with masses of order of 1 TeV or less), the lightest particles are preferred to lie below 400 GeV. In particular, the lightest scalar leptoquarks with masses below 300 GeV are shown to be compatible with the current data on S, T, U at $\chi^2 < 3.1 (3.2)$ for $m_H = 115 (300) GeV$ in comparison with $\chi^2 = 3.5 (5.0)$ in the Standard Model. The lightest scalar gluon in this case is expected to lie below 850 (720) GeV. The possible significance of such particles in the t-quark physics at LHC is emphasized.
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