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Determination of the number of light neutrino species

Document type: Articulo

Abstract

We have measured the cross-section of the production of single photon events in e + e- collisions near the Z ° resonance. For an integrated luminosity of 9.6 pb -1, we have observed 202 single photon candidates with energy between 0.9 and 3.5 GeV in the polar angular region between 45 ° and 135 °. Assuming that the only stable weakly interacting particles are light neutrinos with standard model couplings, we determine the number of light neutrino species to be Nv = 3.14 + 0.24 (stat.)4-0.12 (syst.). This corresponds to an invisible Z ° width of Finv = 524 + 40 4- 20 MeV.

General information

Issue date: 15 de octubre de 1992
Document language: English
Journal: Physics Letters B; vol. 292, no. 3-4
Origin: Facultad de Ciencias Exactas
ISSN: 0370-2693
Pages: 463-471
xmlui.dri2xhtml.METS-1.0.item-dc-subject: cross-section ; Física ; single photon events ; Z° resonance
Subjects: Ciencias Exactas

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Created: 13 de marzo de 2019
Available since: 13 de marzo de 2019
Please, use one of this identificators(URI) for cite o linking this item:
  • http://sedici.unlp.edu.ar/handle/10915/73124
  • https://doi.org/10.1016/0370-2693(92)91204-M

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    Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Except where otherwise noted, this item's license is described as Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)