Adeva, B. ; Adriani, O. ; Aguilar-Benitez, M. ; Gurtu, A. ; et., al (1992) A direct determination of the number of light neutrino families from e+e- → νν̅γ at LEP Physics Letters B, 275 (1-2). pp. 209-221. 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(92)90877-7
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).
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 83323 |
| Deposited On: | 20 Feb 2012 06:12 |
| Last Modified: | 20 Feb 2012 06:12 |
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