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    A direct determination of the number of light neutrino families from e+e−→ν ν γ at LEP (English)

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    In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; 275 , 1-2 ; 209-221  ; 1991
    • ISSN:
      0370-2693
    • Article (Journal)  /  Electronic Resource

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    Abstract The L3 detector at LEP has been used to determine the number of light neutrino families by measuring the cross section of single photon even in e+e− collisions at energies near the Z0 resonance. We have observed 61 single photon candidates with more than 1.5 GeV of deposited energy in the barrel electromagnetic calorimeter, for a total integrated luminosity of 3.0 pb−1. From a likelihood fir to the single photon cross sections, we determin N ν=3.24 ± 0.46 (statistical) ±0.22 (systematic).

    Table of contents – Volume 275, Issue 1-2

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    1
    Calculation of the giant dipole resonance in hot nonspherical heavy nuclei with realistic forces
    Kamerdzhiev, S. / Zawischa, D. et al. | 1991
    7
    Structure of the120Sb nucleus
    Fényes, T. / Dombrádi, Zs. et al. | 1991
    12
    The role of final-state interactions in the p̄p→π+π− annihilation process
    Mull, V. / Holinde, K. / Speth, J. et al. | 1991
    19
    Pion-pion cross section in a dense and hot pionic gas
    Barz, H.W. / Bertsch, G. / Danielewicz, P. / Schulz, H. et al. | 1991
    24
    Mean free path simulation of three body collisions in the Boltzmann-Nordheim-Vlasov equation
    Bonasera, A. / Gulminelli, F. et al. | 1991
    29
    Isotopic dependence of the fusion cross section in the systems 16,18O + 63,65Cu
    Chamon, L.C. / Pereira, D. / Rossi, E.S. / Silva, C.P. / Razeto, G.R. / Borges, A.M. / Gomes, L.C. / Sala, O. et al. | 1991
    33
    Two-particle scattering amplitude in gauge ISO(2,1) quantum gravity
    Guadagnini, E. / Volpi, F. et al. | 1991
    39
    Black hole solution and its infinite parameter generalization in c = 1 string field theory
    Mukherji, Sudipta / Mukhi, Sunil / Sen, Ashoke et al. | 1991
    47
    On the discrete symmetry group of Narain orbifolds
    Spaliński, Michał et al. | 1991
    55
    Kähler potentials for orbifold theories from string amplitudes
    Bailin, David / Gandhi, Sunil K. / Love, Alex et al. | 1991
    63
    Asymmetric non-abelian WZW actions and a 3D string model
    Chamseddine, A.H. et al. | 1991
    70
    On the moduli space of c=0 topological conformal field theories
    Yoshii, Hisahiro et al. | 1991
    75
    On the chiral algebra of topological conformal field theory
    Budzyński, Robert J / Spaliński, Michał et al. | 1991
    82
    Singular vectors by fusions in A 1 (1)
    Bauer, M. / Sochen, N. et al. | 1991
    87
    Characters and representations of new fermionic W-algebras
    Varnhagen, R. et al. | 1991
    93
    The scalar ancestor of the energy-momentum field in critical σ-models at 2 < d < 4
    Lang, K. / Rühl, W. et al. | 1991
    99
    Alternative model of random surfaces
    Ambartzumian, R.V. / Savvidy, G.K. / Savvidy, K.G. / Sukiasian, G.S. et al. | 1991
    103
    Energy perturbations of magnetic bubbles in 2+1 dimensions
    Floratos, E.G. et al. | 1991
    109
    A comment on A. Zamolodchikov's paper concerning self-avoiding polymers
    Smirnov, F.A. et al. | 1990
    112
    Relaxing nucleosynthesis bounds on sterile neutrinos
    Babu, K.S / Rothstein, I.Z et al. | 1991
    119
    Scattering of neutralinos from niobium
    Engel, J. / Pittel, S. / Ormand, E. / Vogel, P. et al. | 1991
    124
    Propagators and four dimensional condensates in pure QCD
    Ahlbach, Jörg / Lavelle, Martin / Schaden, Martin / Streibl, Andreas et al. | 1991
    129
    Non-local condensates in the Nambu model
    Kahana, David / Lavelle, Martin et al. | 1991
    133
    Gauge-dependent condensates and the quark propagator
    Lavelle, Martin J. / Oleszczuk, Michael et al. | 1991
    137
    Strong evidence for a new strange matrix element
    Kaplan, David B. et al. | 1991
    144
    On a mechanism of GSI resonances production
    Arbuzov, B.A. / Shichanin, S.A. / Savrin, V.I. et al. | 1991
    149
    Consequences of the existence of two multiplicity distributions in electron-positron annihilation into pions
    Barshay, Saul / Heiliger, Patrick et al. | 1991
    155
    Nuclear effects in deuteron and the Gottfried sum rule
    Epele, L.N. / Fanchiotti, H. / García Canal, C.A. / Sassot, R. et al. | 1991
    161
    On the decay D s + → p n ̄
    Bediaga, Ignacio / Predazzi, Enrico et al. | 1991
    164
    Probing the heavy Higgs sector via γγ→W L + W L −, ZLZL at a TeV linear collider
    Boos, E.E. / Jikia, G.V. et al. | 1991
    169
    Direct manifestation of the additional isoscalar bosons in the process e+e− → ff̄ at LEP
    Gershtein, S.S. / Likhoded, A.A. / Pankov, A.A. / Yushchenko, O.P. et al. | 1991
    172
    Decay correlations in e+ e − → τ + τ − as a test of quantum mechanics
    Privitera, Paolo et al. | 1991
    181
    Diurnal modulation effects in cold dark matter experiments
    Collar, J.I. / Avignone, F.T. III et al. | 1991
    186
    Higher order Bose-Einstein correlations in pp̄ collisions at √s=630 and 900 GeV
    Neumeister, N. / Gajdosik, T. / Buschbeck, B. / Dibon, H. / Markytan, M. / Weselka, D. / Wulz, C.-E. / Bocquet, G. / Norton, A. / Karimäki, V. et al. | 1991
    195
    Measurement of the decay B − → D∗0ℓ− λ
    Albrecht, H. / Ehrlichmann, H. / Hamacher, T. / Krüger, A. / Nau, A. / Nippe, A. / Nowak, S. / Reidenbach, M. / Schäfer, M. / Schröder, H. et al. | 1991
    202
    Study of electron pair production below the Z mass at the CERN p p collider
    Alitti, J. / Ambrosini, G. / Ansari, R. / Autiero, D. / Bareyre, P. / Bertram, I.A. / Blaylock, G. / Bonamy, P. / Borer, K. / Bourliaud, M. et al. | 1991
    209
    A direct determination of the number of light neutrino families from e+e−→ν ν γ at LEP
    Adeva, B. / Adriani, O. / Aguilar-Benitez, M. / Akbari, H. / Alcaraz, J. / Aloisio, A. / Alverson, G. / Alviggi, M.G. / Ambrosi, G. / An, Q. et al. | 1991
    222
    Search for scalar leptoquarks from Z0 decays
    Abreu, P. / Adam, W. / Adami, F. / Adye, T. / Akesson, T. / Alekseev, G.D. / Allen, P. / Almehed, S. / Alvsvaag, S.J. / Amaldi, U.A. et al. | 1991
    231
    Production of strange particles in the hadronic decays of the Z0
    Abreu, P. / Adam, W. / Adami, F. / Adye, T. / Akesson, T. / Alekseev, G.D. / Allen, P. / Almehed, S. / Alvsvaag, S.J. / Amaldi, U. et al. | 1991
    iii
    Editorial Board
    | 1992

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