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    A precision measurement of the number of neutrino species (English)

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    In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; 249 , 2 ; 341-352  ; 1990
    • ISSN:
      0370-2693
    • Article (Journal)  /  Electronic Resource

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    AbstractWe have measured the cross section for e+e−→hadrons over the center of mass energy range of the Z0 peak, from 88.22 to 95.03 GeV. We determine the Z0 mass Mz=91.164±0.013 (experiment) ±0.030 (LEP) GeV. Within the framework of the standard model we determine the invisible width, Γinvisible=0.502±0.018 GeV, and the number of light neutrino species, Nν=3.01±0.11. We exclude the existence of a supersymmetric scalar neutrino having a mass less than 31.4 GeV, at the 95% confidence level. We performed a model independent combined fit to the e+e−→hadrons and e+e−→μ+μ− data to determine total width, leptonic width and hadronic width of the Z0.

    Table of contents – Volume 249, Issue 2

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    157
    Proton spectral functions for the hole states in 89Y using a self-consistent microscopic formalism
    Van Neck, D. / Waroquier, M. / Ryckebusch, J. et al. | 1990
    163
    The decay out of superdeformed rotational bands
    Vigezzi, E. / Broglia, R.A. / Døssing, T. et al. | 1990
    169
    Influence of the nucleon Fermi motion and binding on the EMC effect
    Nakano, K. et al. | 1990
    175
    Born terms for πN scattering in the Skyrme model. An intuitive approach
    Verschelde, Henri et al. | 1990
    181
    Hypernuclear magnetic moments
    Mareš, J. / Žofka, J. et al. | 1990
    186
    Search for double β-decay of 100Mo and 116Cd to the excited states of 100Ru and 116Sn
    Barabash, A.S. / Kopylov, A.V. / Cherehovsky, V.I. et al. | 1990
    191
    Evidence for direct reaction mechanism in 7 Li ( p , α) 4 He at thermonuclear energies
    Raimann, G. / Bach, B. / Grün, K. / Herndl, H. / Oberhummer, H. / Engstler, S. / Rolfs, C. / Abele, H. / Neu, R. / Staudt, G. et al. | 1990
    195
    Signature of the shape coexistence in 72Kr: discontinuities of the moment of inertia at low spin
    Dejbakhsh, H. / Cormier, T.M. / Zhao, X. / Ramayya, A.V. / Chaturvedi, L. / Zhu, S. / Kormicki, J. / Hamilton, J.H. / Satteson, M. / Lee, I.Y. et al. | 1990
    200
    Stability of inflation in fourth order gravity
    Feldman, Hume A. et al. | 1990
    208
    Covariant w∞ gravity
    Bergshoeff, E. / Pope, C.N. / Stelle, K.S. et al. | 1990
    216
    Self-dual lumps and octonions
    Robertson, Graeme D. et al. | 1990
    220
    Leading tadpole divergences in string partition function
    Russo, J. / Tseytlin, A.A. et al. | 1990
    229
    Free phases and mirror symmetry in fermionic superstrings
    Castellani, Leonardo / Monteiro, Marco R. / Fré, Pietro / Gliozzi, Ferdinando et al. | 1990
    237
    Landau-Ginzburg theories as orbifolds
    Lynker, Monika / Schimmrigk, Rolf et al. | 1990
    243
    Universality of additional neutral currents
    Gilevsky, V.V. et al. | 1990
    249
    Does the boundary contribution to the one-loop β-function vanish for gauged supergravity?
    Poletti, Stephen et al. | 1990
    255
    Particle actions as Wess-Zumino terms for spacetime (super) symmetry groups
    Gauntlett, J.P. / Gomis, J. / Townsend, P.K. et al. | 1990
    261
    Instanton-induced amplitudes in a supersymmetric theory
    McLerran, L. / Vainshtein, A. / Voloshin, M. et al. | 1990
    266
    Temperature inversion symmetry in the Gross-Neveu model
    Ravndal, F. / Wotzasek, C. et al. | 1990
    269
    Monopole in the Coleman-Weinberg model
    Kiselev, V.G. et al. | 1990
    273
    Third generation masses from a two Higgs model fixed point
    Froggatt, C.D. / Knowles, I.G. / Moorhouse, R.G. et al. | 1990
    281
    The effect of dilatons on the electroweak phase transition
    Buchmüller, W. / Wyler, D. et al. | 1990
    286
    Three-point functions at finite temperature
    Evans, T.S et al. | 1990
    291
    The singlet Goldberger-Treiman relation and models for the proton's spin
    Birse, Michael C. et al. | 1990
    295
    Heavy-light hadrons and current-induced transitions among them
    Hussain, F. / Körner, J.G. / Schilcher, K. / Thompson, G. / Wu, Y.L. et al. | 1990
    303
    Forward energy flows in nucleus-nucleus collisions and forward nucleon-nucleon collisions at high energies
    Pan, Ji-Cai et al. | 1990
    309
    Relativistic quark model predictions for meson radiative transition form factors
    Aznauryan, I.G. / Oganessyan, K.A. et al. | 1990
    314
    Heavy meson pair production in e+e− annihilation from the static quark effective theory
    Falk, Adam F. / Grinstein, Benjamín et al. | 1990
    321
    New correlation functions for multi-particle processes
    Voloshin, Sergei / Seibert, David et al. | 1990
    325
    CP asymmetry in K±→π±π0
    Dib, C.O. / Peccei, R.D. et al. | 1990
    331
    Production of Higgs particles in diffractive hadron-hadron collisions
    Schäfer, Andreas / Nachtmann, Otto / Schöpf, Rainer et al. | 1990
    336
    A search for inclusive production of heavy stable particles by the TOPAZ detector at TRISTAN
    Adachi, I. / Anazawa, M. / Doser, M. / Enomoto, R. / Fujii, H. / Fujii, K. / Fujii, T. / Fujimoto, J. / Fujio, N. / Fujiwara, N. et al. | 1990
    341
    A precision measurement of the number of neutrino species
    Adeva, B. / Adriani, O. / Aguilar-Benitez, M. / Akbari, H. / Alcaraz, J. / Aloisio, A. / Alverson, G. / Alviggi, M.G. / An, Q. / Anderhub, H. et al. | 1990
    353
    Observation of a new ηπ0π0 resonance at 1900 MeV/c2 in two-photon scattering
    Karch, K. / Antreasyan, D. / Bartels, H.W. / Besset, D. / Bieler, Ch. / Bienlein, J.K. / Bizzeti, A. / Bloom, E.D. / Brock, I. / Brockmüller, K. et al. | 1990
    359
    Study of inclusive semileptonic B meson decays
    Albrecht, H. / Ehrlichmann, H. / Gläser, R. / Harder, G. / Krüger, A. / Nau, A. / Nilsson, A.W. / Nippe, A. / Oest, T. / Reidenbach, M. et al. | 1990
    366
    Measurement of the neutron and the proton F2 structure function ratio
    Allasia, D. / Amaudruz, P. / Arneodo, M. / Arvidson, A. / Badelek, B. / Baum, G. / Beaufays, J. / Bird, I.G. / Botje, M. / Burger, W.J. et al. | 1990

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