2002/09/28 by A. D. Smirnov, Smirnov, A. D.
Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0209344
10 pages, 2 figures, submitted to Proceedings of the 12 th International Seminar on High Energy Physics "Quarks-2002", Novgorod the Great, Russia, June 1-7, 2002
arxiv created 2002/09/28 · openalex publication_date 2002/09/28 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 existence of the relatively light scalar leptoquarks and scalar gluons (with masses of order of 1 TeV or less) is consistent with the current experimental data on S, T, U and the more light particles (with masses below 400 GeV) improve the fit. In particular, the lightest scalar leptoquarks with masses below 300 GeV are consistent with the current data on S, T, U at χ2 < 3.1(3.2) for mH=115(300) GeV in comparison with χ2 = 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 and their effect on the gauge coupling constant unification is briefly discussed.