LIMITS ON DIRECT NEW PHYSICS EFFECTS FROM 1991 LEP DATA

被引：15

作者：

LAYSSAC, J ^{[1
]}

RENARD, FM ^{[1
]}

VERZEGNASSI, C ^{[1
]}

机构：

[1] UNIV TRIESTE,DIPARTIMENTO FIS TEOR,I-34014 TRIESTE,ITALY

来源：

PHYSICS LETTERS B | 1992年 / 287卷 / 1-3期

关键词：

D O I：

10.1016/0370-2693(92)91912-S

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We update the limits on direct corrections to Z couplings using 1991 LEP data. By suitable combinations of observables we eliminate the large uncertainties appearing in oblique corrections, for example the unknown top quark mass. Applications to Z-Z' mixing effects are given in the general case as well as for specific models. In some cases one now reaches the level of 0.005 for the Z-Z' mixing angle and more than 1 TeV for the Z' mass. In addition a special combination of observables (called D) totally free of any oblique correction, appears to be the best indicator for direct vertex corrections (of any origin) to the Z couplings. Its central value appears to be positive but within one standard deviation, consistent with zero.

引用

页码：267 / 276

页数：10

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