Bounds on scalar leptoquark masses from S, T, U parameters in the minimal four-color quark-lepton symmetry model

Details Bounds on scalar leptoquark masses from S, T, U parameters in the minimal four-color quark-lepton symmetry model Bounds on scalar leptoquark masses from S, T, U parameters in the minimal four-color quark-lepton symmetry model

1998-05-15

arxiv.org/abs/hep-ph/9805339v1

Phys.Lett. B431 (1998) 119-126

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 3 ps figures, LaTeX, uses epsf.sty, accepted for publication in Physics Letters B

Scientific paper

10.1016/S0370-2693(98)00578-4

The contributions into radiative correction parameters S, T, U from the scalar leptoquarks are calculated in the minimal gauge model with the four-color quark-lepton symmetry. It is shown that the contributions into T and U from the scalar leptoquark doublets are not positive definite. Using the current experimental data on S, T, U the bounds on the scalar leptoquark masses are obtained. In particular, the existence of the relatively light scalar leptoquark with electric charge 2/3 is shown to be compatible with the current experimental data on S, T, U.

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