Use all functions optimally: LOGIN NOW

    Measurement of Z0 decays to hadrons, and a precise determination of the number of neutrino species (English)

    Free access
    In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; 237 , 1 ; 136-146  ; 1990
    • ISSN:
      0370-2693
    • Article (Journal)  /  Electronic Resource

    How to get this title?

    Download

    Export, share and cite

    Abstract We have made a precise measurement of the cross section for e+e−→Z0→hadrons with the L3 detector at LEP, covering the s range from 88.28 to 95.04 GeV. From a fit to the Z0 mass, total width, and the hadronic cross section to be M Z 0=91.160 ± 0.024 (experiment) ±0.030(LEP) GeV, Γ Z 0=2.539±0.054 GeV, and σ h(M Z 0)=29.5±0.7 nb. We also used the fit to the Z0 peak cross section and the width todetermine Γ invisible=0.548±0.029 GeV, which corresponds to 3.29±0.17 species of light neutrinos. The possibility of four or more neutrino flavors is thus ruled out at the 4σ confidence level.

    Table of contents – Volume 237, Issue 1

    Show all volumes and issues

    The tables of contents are generated automatically and are based on the data records of the individual contributions available in the index of the TIB portal. The display of the Tables of Contents may therefore be incomplete.

    1
    Short-range correlations in light nuclei near the neutron drip line
    Ren, Zhongzhou / Xu, Gongou et al. | 1989
    3
    In-medium stiffening of the nucleon-nucleon spin-isospin interaction
    Brown, G.E / Rho, Mannque et al. | 1989
    8
    Confined quarks and the neutrinoless ββ decay
    Suhonen, J. / Khadkikar, S.B. / Faessler, Amand et al. | 1989
    14
    Nature of the α-12C potential at low energy using an inverse scattering method
    Alam, M.M. / Malik, F.B. et al. | 1989
    19
    Polarization potentials in heavy ion scattering and fusion
    Kim, B.T. / Naito, M. / Udagawa, T. et al. | 1989
    24
    Limiting excitation energy in the reaction Si+Si
    Griffioen, K.A. / Meijer, R.J. / Box, P.F. / Decowski, P. / Van Nieuwenhuizen, G.J. / Kamermans, R. / Wilschut, H.W. / Giorni, A. / Morand, C. / Demeyer, A. et al. | 1989
    29
    Study of the proton-deuteron break-up reaction in complete kinematics at 1 GeV
    Aleshin, N.P. / Belostotsky, S.L. / Dotsenko, Yu.V. / Grebenyuk, O.G. / Kochenda, L.M. / Kudin, L.G. / Kuropatkin, N.P. / Manayenkov, S.I. / Miklukho, O.V. / Nikulin, V.N. et al. | 1989
    33
    Pion induced transitions to double-isobaric-analog states at 35 MeV on 1 f 7 2 -shell nuclei
    Weinfeld, Z. / Piasetzky, E. / Leitch, M.J. / Baer, H.W. / Mishra, C.S. / Comfort, J.R. / Tinsley, J. / Wright, D.H. et al. | 1989
    37
    False vacuum decay in Jordan-Brans-Dicke cosmologies
    Holman, Richard / Kolb, Edward W. / Vadas, Sharon L. / Wang, Yun / Weinberg, Erick J. et al. | 1989
    43
    The ising model coupled to 2D gravity. A nonperturbative analysis
    Brézin, Edouard / Douglas, Michael R. / Kazakov, Vladimir / Shenker, Stephen H. et al. | 1989
    47
    Axionic black holes from massive axions
    Allen, Theodore J. / Bowick, Mark J. / Lahiri, Amitabha et al. | 1989
    52
    Wormhole solutions in scalar theories with non-Abelian global symmetry
    Goto, Toru / Okada, Yasuhiro et al. | 1989
    59
    The γ 5-problem and anomalies — A Clifford algebra approach
    Kreimer, Dirk et al. | 1989
    63
    Vacuum energy for a non-critical closed string compactified on the torus
    Odintsov, S.D. et al. | 1989
    68
    Observables in the topological quantum field theory of monopoles
    Spaliński, M. et al. | 1989
    72
    Elastic neutralino-matter scattering
    Flores, Ricardo / Olive, Keith A. / Srednicki, Mark et al. | 1989
    77
    Dirac neutrino magnetic moments in the left-right symmetric model
    Rajpoot, Subhash et al. | 1989
    81
    A model for a large neutrino magnetic transition moment and naturally small mass
    Leurer, Miriam / Marcus, Neil et al. | 1989
    88
    Constraints on the two-Higgs doublet model and the tau neutrino magnetic moment from recent LEP data
    Rizzo, Thomas G. et al. | 1989
    91
    W decay into massive fermions and a photon
    Tupper, Gary / Reid, Jim / Li, Guowen / Samuel, Mark et al. | 1989
    95
    The static approximation, staggered fermions and f B
    Hernández, Oscar F. / Hill, Brian R. et al. | 1989
    102
    Regge trajectories of baryons in the MIT bag model
    Iwasaki, M. / Wakimaru, K. et al. | 1989
    107
    The top quark mass from weak boson masses without neutral currents
    Halzen, Francis / Morris, Duncan A. et al. | 1989
    113
    Do we understand the resummation of soft gluons in W events?
    Fletcher, R.S. / Halzen, F. / Grau, A. / Pancheri, G. / Srivastava, Y.N. et al. | 1989
    120
    On the QCD evolution of the spin structure function of the proton
    Schreiber, A.W. / Thomas, A.W. / Londergan, J.T. et al. | 1989
    127
    Two-loop QED vertex correction from virtual heavy fermions
    Kniehl, Bernd A. et al. | 1989
    130
    Where is the spin of the proton — constraints for model builders
    Lipkin, Harry J. et al. | 1989
    136
    Measurement of Z0 decays to hadrons, and a precise determination 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
    iii
    Editorial Board
    | 1990

    How to get this title?

    Download

    Export, share and cite

    Feedback