Negative contributions to S in an effective field theory

被引：20
|
作者：
Dobrescu, BA
Terning, J
机构：
[1] Boston Univ, Dept Phys, Boston, MA 02215 USA
[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
来源：
PHYSICS LETTERS B | 1998年 / 416卷 / 1-2期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1016/S0370-2693(97)01304-X
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We show that an effective field theory that includes non-standard couplings between the electroweak gauge bosons and the top and bottom quarks may yield negative contributions to both the S and T oblique radiative electroweak parameters. a We find that that such an effective field theory provides a better fit to data than the standard model (the chi(2) per degree of freedom is half as large). We examine in some detail an illustrative model where the exchange of heavy scalars produces the correct type of non-standard couplings. (C) 1998 Elsevier Science B.V.
引用
收藏
页码：129 / 136
页数：8
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