en
Scientific article
English

The number of neutrinos and the Z line shape

ContributorsBlondel, Alain
Published inComptes rendus. Physique, vol. 3, no. 9, p. 1155-1164
Publication date2002
Abstract

Thanks to a precise calibration and monitoring of the LEP beam energy the Z resonance line shape has been precisely measured, hence permitting accurate determinations of the Z mass and width. A large effort was spent by the experiments for the measurement of the LEP luminosity, enabling the number of neutrino types to be precisely determined. The result, Nν=2.9841±0.0083, demonstrates the existence of only 3 neutrino species.

Keywords
  • Z line shape
  • Z mass
  • Neutrino types
Citation (ISO format)
BLONDEL, Alain. The number of neutrinos and the Z line shape. In: Comptes rendus. Physique, 2002, vol. 3, n° 9, p. 1155–1164. doi: 10.1016/S1631-0705(02)01393-2
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ISSN of the journal1631-0705
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