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A DIRECT DETERMINATION OF THE NUMBER OF LIGHT NEUTRINO FAMILIES FROM E+E--]NU-NU-BAR-GAMMA AT LEP

Abstract:
The L3 detector at LEP has been used to determine the number of light neutrino families by measuring the cross section of single photon even in e+e- collisions at energies near the Z0 resonance. We have observed 61 single photon candidates with more than 1.5 GeV of deposited energy in the barrel electromagnetic calorimeter, for a total integrated luminosity of 3.0 pb-1. From a likelihood fir to the single photon cross sections, we determin Nν=3.24 ± 0.46 (statistical) ±0.22 (systematic). © 1992.
Publication status:
Published

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Journal:
Physics Letters B More from this journal
Volume:
275
Issue:
1-2
Pages:
209-221
Publication date:
1992-01-23
DOI:
ISSN:
0370-2693
Pubs id:
pubs:2116
UUID:
uuid:a804d512-34a3-4cd6-9317-dbe02589e0ca
Local pid:
pubs:2116
Source identifiers:
2116
Deposit date:
2012-12-19

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