Measurement of the mass and width of the Zo particle from multihadron final states produced in e+e--annihilations
Measurement of the mass and width of the Zo particle from multihadron final states produced in e+e--annihilations
复制标题
测量 e e-湮灭中产生的多强子最终态的 Zo 粒子的质量和宽度
DOI：
10.1016/0370-2693(89)90706-5
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
S. Johansson
中科院分区：
文献类型：
--
作者：
Aarnio;S. Johansson
首次测量的质量和宽度的Z0在新委托的LEP对撞机的德尔菲合作。这些测量来自于对多强子末态的研究，这些末态产生于Z 0质量附近几个能量的e+e−湮灭。发现质量和宽度的值为M（Z0）=91.06±0.09（静态）±0.045（系统）。GeV和Γ（Z_0）=2.42±0.21（stat.）分别为GeV，来自对线形的三参数拟合。在标准模型的框架下进行双参数拟合，得到轻中微子种类数Nν=2.4±0.4（stat.）±0.5（系统）。
First measurements of the mass and width of the Z0performed at the newly commissioned LEP Collider by the DELPHI Collaboration are presented. The measuements are derived from the study of multihadronic final states produced in e+e−annihilations at several energies around the Z0mass. The values found for the mass and width are M(Z0)=91.06±0.09 (stat) ±0.045 (syst.) GeV and Γ(Z0)=2.42±0.21 (stat.) GeV respectively, froma three-parameter fit to the line shape. A two-parameter fit in the framework of the standard model yields for the number of light neutrino species Nν=2.4±0.4 (stat.) ±0.5 (syst.).