Vorobyov, A. A. ; Vorvolakos, A. ; Wadhwa, M. ; Wallraff, W. ; Wang, J. C. ; Wang, X. L. ; Wang, Z. M. ; Weber, A. ; Wu, S. X. ; Wynhoff, S. ; Xu, J. ; Xu, Z. Z. ; Yang, B. Z. ; Yang, C. G. ; Yao, X. Y. ; Ye, J. B. ; Yeh, S. C. ; You, J. M. ; Zalite, An. ; Zalite, Yu. ; Zemp, P. ; Zeng, Y. ; Zhang, Z. ; Zhang, Z. P. ; Zhou, B. ; Zhou, Y. ; Zhu, G. Y. ; Zhu, R. Y. ; Zichichi, A. ; Ziegler, F. ; Gurtu, A. ; et., al (1998) Determination of the number of light neutrino species from single photon production at LEP Physics Letters B: Nuclear Physics and Particle Physics, 431 (1-2). pp. 199-208. ISSN 0370-2693
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S03702...
Related URL: http://dx.doi.org/10.1016/S0370-2693(98)00519-X
Abstract
A determination of the number of light neutrino families performed by measuring the cross section of single photon production in e+e- collision near the Z resonance is reported. From an integrated luminosity of 100 pb-1, collected during the years 1991-94, we have observed 2091 single photon candidates with an energy above 1 GeV in the polar angular region 45° <θγ <135°. From a maximum likelihood fit to the single photon cross section, the Z decay width into invisible particles is measured to be ⌈inv=498± 12(stat)± 12(sys) MeV. Using the Standard Model couplings of neutrinos to the Z, the number of light neutrino species is determined to be Nv=2.98± 0.07(stat)± 0.07(sys).
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 11604 |
| Deposited On: | 13 Nov 2010 14:11 |
| Last Modified: | 16 May 2016 21:03 |
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