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Determination of the number of light neutrino species from single photon production at LEP

Document type: Articulo

Abstract

A determination of the number of light neutrino families performed by measuring the cross section of single photon production in eqey collision near the Z resonance is reported. From an integrated luminosity of 100 pby1 , collected during the years 1991–94, we have observed 2091 single photon candidates with an energy above 1 GeV in the polar angular region 458-u -1358. From a maximum likelihood fit to the single photon cross section, the Z decay width into invisible particles g is measured to be G s498"12 stat Ž . Ž. "12 sys MeV. Using the Standard Model couplings of neutrinos to the Z, the inv number of light neutrino species is determined to be N s2.98"0.07 stat Ž . Ž. "0.07 sys.

General information

Issue date: 9 de julio de 1998
Document language: English
Journal: Physics Letters B; vol. 431, no. 1-2
Origin: Facultad de Ciencias Exactas
ISSN: 0370-2693
Pages: 199-208
xmlui.dri2xhtml.METS-1.0.item-dc-subject: Física ; light neutrino species ; photon ; LEP
Subjects: Ciencias Exactas

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Created: 10 de mayo de 2019
Available since: 10 de mayo de 2019
Please, use one of this identificators(URI) for cite o linking this item:
  • http://sedici.unlp.edu.ar/handle/10915/74919
  • https://doi.org/10.1016/S0370-2693(98)00519-X

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