Extra quark-lepton generations and precision measurements

被引：95
|
作者：
Maltoni, M [1 ]
Novikov, VA
Okun, LB
Rozanov, AN
Vysotsky, MI
机构：
[1] Univ Ferrara, Dipartmento Fis, I-44100 Ferrara, Italy
[2] CNR, Ist TeSRE, I-40129 Bologna, Italy
[3] Ist Nazl Fis Nucl, Sezione Ferrara, I-44100 Ferrara, Italy
[4] ITEP, Moscow 117218, Russia
[5] ITEP, F-13288 Marseille, France
[6] Univ Mediterranee, CNRS, IN2P3, CPPM, F-13288 Marseille, France
[7] ITEP, Ferrara, Italy
[8] Ist Nazl Fis Nucl, Sezione Ferrara, Ferrara, Italy
来源：
PHYSICS LETTERS B | 2000年 / 476卷 / 1-2期
基金：
俄罗斯基础研究基金会;
关键词：
D O I：
10.1016/S0370-2693(00)00109-X
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The existence of extra chiral generations with all fermions heavier than M-Z is strongly disfavoured by the precision electroweak data. However the data are fitted nicely even by a few extra generations, if one allows neutral leptons to have masses close to 50 GeV. The data allow inclusion of one additional generation of heavy fermions in SUSY extension of Standard Model if chargino and neutralino have masses close to 60 GeV with Delta m similar or equal to 1 GeV. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码：107 / 115
页数：9
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