A precision measurement of the number of neutrino species

Adeva, B. ; Adriani, O. ; Aguilar-Benitez, M. ; Gurtu, A. ; et., al (1990) A precision measurement of the number of neutrino species Physics Letters B, 249 (12). pp. 341-352. ISSN 0370-2693

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0370-2693(90)91267-F


We have measured the cross section for e+e→hadrons over the center of mass energy range of the Z0 peak, from 88.22 to 95.03 GeV. We determine the Z0 mass Mz=91.164±0.013 (experiment) ±0.030 (LEP) GeV. Within the framework of the standard model we determine the invisible width, γinvisible=0.502±0.018 GeV, and the number of light neutrino species, Nν=3.01±0.11. We exclude the existence of a supersymmetric scalar neutrino having a mass less than 31.4 GeV, at the 95% confidence level. We performed a model independent combined fit to the e+e→hadrons and e+e→μ+μ data to determine total width, leptonic width and hadronic width of the Z0.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:83643
Deposited On:21 Feb 2012 14:49
Last Modified:21 Feb 2012 14:49

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