CAN STOP BE LIGHT ENOUGH

被引：16

作者：

KON, T ^{[1
]}

NONAKA, T ^{[1
]}

机构：

[1] RIKKYO UNIV,DEPT PHYS,TOKYO 171,JAPAN

来源：

PHYSICS LETTERS B | 1993年 / 319卷 / 1-3期

关键词：

D O I：

10.1016/0370-2693(93)90826-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We examine a possibility for the existence of a light supersymmetric partner of the top quark (stop) with mass 15-20 GeV in the framework of the minimal supergravity GUT model. Such light stop could ''plain the slight excess of the high p(T) cross section of the D*+/- -meson production in the two-photon process at TRISTAN. We point out that the existence of such a stop could change the dominant decay mode of some particles and could weaken substantially present experimental bounds on the supersymmetric parameter space. It seems that there is a finite parameter region allowing the existence of the light stop even if we consider the present experimental data. Inversely, if the light stop was discovered at TRISTAN, masses and mixing parameters of the other SUSY partners as well as masses of the Higgs and the top will be severely constrained, for example, m(g) congruent-to 75 GeV, m(W1) less than or similar to 55 GeV, 90 GeV less than or similar to m(l) less than or similar to 130 GeV, 100 GeV less than or similar to m(q) less than or similar to 150 GeV, m(h) less than or similar to 60 GeV and 115 GeV less than or similar to m(t) less than or similar to 135 GeV. Some phenomenological implications on the present and future experiments are also discussed.

引用

页码：355 / 364

页数：10

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