S, T, and Leptoquarks at HERA

Details S, T, and Leptoquarks at HERA S, T, and Leptoquarks at HERA

1997-07-02

arxiv.org/abs/hep-ph/9707214v1

Phys.Rev.Lett. 79 (1997) 4318-4320

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages including 3 figures

Scientific paper

10.1103/PhysRevLett.79.4318

If the recently discovered anomalous events at HERA are due to a scalar leptoquark, then it is very likely to have weak isospin $I = 1/2$. In that case, present precision measurements of the oblique radiative parameters $S$ and $T$ provide strong constraints on the mass of the other component of this doublet. If the standard model is extended to include such a doublet, a slightly better fit may in fact be obtained. However, in specific proposed models where this doublet comes from a larger symmetry, there are often additional large and positive contributions to $S$ from exotic heavy fermions which far exceed the present experimental limit. A way to improve the Tevatron exploration of leptoquarks is proposed.

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