Adriani, O. ; Aguilar-Benitez, M. ; Ahlen, S. ; Gurtu, A. ; et., al (1992) Determination of the number of light neutrino species Physics Letters B, 292 (3-4). pp. 463-471. 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)91204-M
Abstract
We have measured the cross-section of the production of single photon events in e+ e- collisions near the Z0 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 N v=3.14 ± 0.24 (stat.)±0.12 (syst.). This corresponds to an invisible Z0 width of Γinv = 524 ± 40 ± 20 MeV.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 83334 |
| Deposited On: | 20 Feb 2012 06:14 |
| Last Modified: | 20 Feb 2012 06:14 |
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