Indications for an extra neutral gauge boson in electroweak precision data

被引：159

作者：

Erler, J ^{[1
]}

Langacker, P ^{[1
]}

机构：

[1] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.84.212

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new analysis of the hadronic peak cross section at LEP 1 implies a small amount of missing invisible width in Z decays, while the effective weak charge in atomic parity violation has been determined recently to 0.6% accuracy, indicating a significantly negative S parameter. As a consequence, the data are described well if the presence of an extra Z' boson, such as predicted in grand unified theories, is assumed. Moreover, the data are now rich enough to study an arbitrary extra Z' boson and to determine its couplings in a model independent way. An excellent fit to the data is obtained in this case, suggestive of a family nonuniversal Z' similar to those predicted in a class of superstring theories.

引用

页码：212 / 215

页数：4

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