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    Measurement of η c production in untagged two-photon collisions at LEP (English)

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    In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; 318 , 3 ; 575-582  ; 1993
    • ISSN:
      0370-2693
    • Article (Journal)  /  Electronic Resource

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    Abstract A study of twelve distinct decay channels of the η c has been performed with the L3 detector at LEP, for an integrated luminosity of 30 pb−1. Summing all channels, 28 candidate events have been identified, with an estimated background of 11 events. The two-photon radiative width is evaluated to be Γ γγ(η c) = 8.0 ± 2.3 ± 2.4 keV.

    Table of contents – Volume 318, Issue 3

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    405
    What is wrong with the Bethe-formula for the nuclear level-density? measurable differences between grandcanonical and the microcanonical treatments
    Gross, D.H.E. / Heck, R. et al. | 1993
    410
    Photodisintegration of the deuteron in the Δ-resonance region
    Wilhelm, P. / Arenhövel, H. et al. | 1993
    410
    Photodisintegration of the deuteron in the cap delta-resonance region
    Wilhelm, P. / Arenhoevel, H. et al. | 1993
    415
    A coupled-channels study of 11Li Coulomb dissociation
    Canto, L.F. / Donangelo, R. / Romanelli, A. / Schulz, H. et al. | 1993
    419
    Short-time scale characteristics of intermediate energy heavy ion collisions
    Łukasik, J. / Majka, Z. / Kozik, T. et al. | 1993
    424
    Solid on solid on fluid lattices
    Baillie, C.F. / Janke, W. / Johnston, D.A. et al. | 1993
    433
    On the linearisation of classical membrane dynamics
    FitzGerald, P.L. et al. | 1993
    438
    On the calculation of effective actions by string methods
    G. Schmidt, Michael / Schubert, Christian et al. | 1993
    447
    Model-independent properties and cosmological implications of the dilaton and moduli sectors of 4D strings
    de Carlos, B. / Casas, J.A. / Quevedo, F. / Roulet, E. et al. | 1993
    457
    Rational W algebras from composite operators
    Delduc, F. / Frappat, L. / Sorba, P. / Toppan, F. / Ragoucy, E. et al. | 1993
    465
    Triviality of function in Chern-Simons theory with matter fields
    Kapustin, A.N. / Pronin, P.I. et al. | 1993
    469
    Naturalness versus supersymmetric non-renormalization theorems
    Seiberg, Nathan et al. | 1993
    476
    Dynamical symmetry breaking in a Nambu-Jona-Lasinio model and the vacuum structure
    Dudas, E.A. et al. | 1993
    481
    Spin and electron structure
    Pavšič, Matej / Recami, Erasmo / Rodrigues, Waldyr A. Jr / Maccarrone, G.Daniele / Raciti, Fabio / Salesi, Giovanni et al. | 1993
    489
    Electron-positron pair production by a neutrino in an external electromagnetic field
    Borisov, A.V. / Ternov, A.I. / Zhukovsky, V.Ch. et al. | 1993
    492
    Sphaleron transitions in a realistic heat bath
    Krasnitz, A. / Potting, R. et al. | 1993
    501
    Remarks on quenching in the Schwinger model
    Grandou, Thierry et al. | 1993
    507
    Baryon-baryon potentials on the lattice
    Rabitsch, K. / Markum, H. / Sakuler, W. et al. | 1993
    511
    High statistics study of the gluon propagator in the Landau gauge at ß = 6.0
    Marenzoni, P. / Martinelli, G. / Stella, N. / Testa, M. et al. | 1993
    517
    The effect of SU(3) colour singletness on the quark-gluon deconfinement phase transition in the MIT bag
    Mustafa, M.G. et al. | 1993
    524
    On the reparameterization invariance in heavy quark effective theory
    Yu-Qi, Chen et al. | 1993
    531
    On the spectral density of Euclidean Dirac operator in QCD
    Smilga, A.V. / Stern, J. et al. | 1993
    537
    The electroweak couplings of constituent quarks in the nonlocal chiral quark model
    Li, Xiaoyuan / Liao, Yi et al. | 1993
    544
    The charm content of W + 1 jet events as a probe of the strange quark distribution function
    Baur, U. / Halzen, F. / Keller, S. / Mangano, M.L. / Riesselmann, K. et al. | 1993
    549
    Two body non-leptonic decays of B and B s mesons
    Deandrea, A. / Di Bartolomeo, N. / Gatto, R. / Nardulli, G. et al. | 1993
    559
    The deuteron spin-dependent structure function g 1 D(x, Q 2) and the effect of relativistic Fermi motion
    Tokarev, M.V. et al. | 1993
    559
    The deuteron spin-dependent structure function g^D~1(x, Q^2) and the effect of relativistic Fermi motion
    Tokarev, M. V. et al. | 1993
    565
    A new determination of the π N N coupling constant f 2
    Markopoulou-Kalamara, F.G. / Bugg, D.V. et al. | 1993
    568
    Fractal analysis of pseudorapidity fluctuations in 4.5 A GeV/c C-(Ne, Cu) central collisions
    Sarkisyan, E.K. / Gelovani, L.K. / Taran, G.G. / Sakharov, G.I. et al. | 1993
    575
    Measurement of η c production in untagged two-photon collisions at LEP
    Adriani, O. / Aguilar-Benitez, M. / Ahlen, S. / Alcaraz, J. / Aloisio, A. / Alverson, G. / Alviggi, M.G. / Ambrosi, G. / An, Q. / Anderhub, H. et al. | 1993
    575
    Measurement of eta~c production in untagged two-photon collisions at LEP
    | 1993

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