A Precise Determination of the Number of Families With Light Neutrinos and of the $Z$ Boson Partial Widths



CERN-LEP. ALEPH Collaboration. Precise determination of the Z0 parameters based on 20,000 Z0 decays. The Z0 mass is measured to be 91.182 +- 0.026 +- 0.030 GeV. (The first error comes from the experiment and the second from the beam). The Z0 total width is 2.541 +- 0.056 GeV. The number of light neutrino species is determined to be 3.01 +- 0.15 +- 0.05. The cross sections are measured with two independent triggers, (i) the calorimeter trigger, and (ii) a penetrating charged particle track trigger. An average value is also given.
Date made available23 Oct 1990
  • Properties of hadronic events in e+e- annihilation at s=91 GeV

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    Research output: Contribution to journalArticleResearchpeer-review

    63 Citations (Scopus)
  • Properties of Hadronic Events in e$^{+} $e$^{-}$ Annihilation at $S^{(1/2)}=91$-{GeV}

    Decamp, D. (Creator), Deschizeaux, B. (Creator), Lees, J. (Creator), Minard, M. (Creator), Crespo, J. M. (Creator), Delfino Reznicek, M. C. (Creator), Fernandez, E. (Creator), Martinez, M. (Creator), Miquel, R. (Creator), Mir, M. L. (Creator), Orteu, S. (Creator), Pacheco, A. (Creator), Perlas, J. A. (Creator), Tubau, E. (Creator), Catanesi, M. G. (Creator), De Palma, P. M. (Creator), Farilla, A. (Creator), Iaselli, G. (Creator), Maggi, G. (Creator), Mastrogiacomo, A. (Creator), Natali, S. (Creator), Nuzzo, S. (Creator), Ranieri, A. (Creator), Raso, G. (Creator), Romano, F. (Creator), Ruggieri, F. (Creator), Selvaggi, G. (Creator), Silvestris, L. (Creator), Tempesta, P. (Creator), Zito, G. (Creator), Chen, Y. (Creator), Huang, D. (Creator), Lin, J. (Creator), Ruan, T. (Creator), Wang, T. (Creator), Wu, W. (Creator), Xie, Y. (Creator), Xu, D. (Creator), Xu, R. (Creator), Zhang, J. (Creator), Zhao, W. (Creator), Albrecht, H. (Creator), Bird, F. (Creator), Blucher, E. 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