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    A high-statistics study of ϒ-meson production in π-W reactions at 286 GeV/c (English)

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    In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; 179 , 1-2 ; 170-176  ; 1986
    • ISSN:
      0370-2693
    • Article (Journal)  /  Electronic Resource

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    Abstract With a sample of about 2000(γ+γ′+γ″) events observed in π-W interactions at 286GeV/c, the ratio (γ′+γ″)/γ=0.51±0.07, the branching ratio times the inclusive total cross section Bσ=(386±17±85) pb per W nucleus, as well as the differential cross sections in χF and p T have been measured. These results are compared with previous data obtained with the same apparatus at a lower beam momentum (194 GeV/c). Both data sets are compared with a theoretical calculation (“duality model”) which also allows one to extract the shape parameter βg of the gluon distribution in the pion. βg is found to be 2.3−0.3 +0.4(stat.) −0.5 +0.1(syst.).

    Table of contents – Volume 179, Issue 1-2

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    1
    On the nature of low-lying 7 2 + states in odd-A Tc, Rh and Ag nuclei
    Heyde, K. / Paar, V. et al. | 1986
    4
    Absence of attraction in the NN central potential derived from skyrmions
    Kälbermann, G. / Eisenberg, J.M. / Silbar, Richard R. / Sternheim, Morton M. et al. | 1986
    9
    Radial excitations in nucleon-nucleon scattering
    Silvestre-Brac, B. / Carbonell, J. / Gignoux, C. et al. | 1986
    15
    Role of kaon exchange in the p p → Λ Λ reaction
    Kohno, M. / Weise, W. et al. | 1986
    20
    Ratio of the isovector effective interaction strengths ‖J στ/J τ‖2 between 200 and 450 MeV from the 14C(p, n) 14N reaction
    Alford, W.P. / Helmer, R.L. / Abegg, R. / Celler, A. / Häusser, O. / Hicks, K. / Jackson, K.P. / Miller, C.A. / Yen, S. / Azuma, R.E. et al. | 1986
    25
    Yields of residual nuclei after antiproton annihilation in 95Mo and 98Mo
    Moser, E.F. / Daniel, H. / Von Egidy, T. / Hartmann, F.J. / Kanert, W. / Schmidt, G. / Nicholas, M. / Reidy, J.J. et al. | 1986
    30
    Energy-density fluctuations in de Sitter space
    Brandenberger, Robert H. / Hill, Christopher T. et al. | 1986
    37
    Cosmic string from hidden-sector flux tubes
    Campbell, B.A. / Ellis, J. / Nanopoulos, D.V. / Olive, K.A. / Rudaz, S. et al. | 1986
    43
    New candidates for string field theory from the cohomology of C∗ algebras
    Crane, Louis / Gómez, Cesar et al. | 1986
    47
    Compactifications and θ-structures in string theories
    Li, Miao et al. | 1986
    51
    A bosonic representation of the N = 2 superconformal algebra
    Aratyn, H. / Damgaard, P.H. et al. | 1986
    57
    The vertex function in Witten's formulation of string field theory
    Cremmer, Eugene / Schwimmer, Adam / Thorn, Charles et al. | 1986
    66
    Manifestly Lorentz covariant string theories in D = 10 and D = 18
    Cederwall, Martin et al. | 1986
    69
    The BRST quantization of the O(2) string
    Bogojevic, Aleksandar R. / Hlousek, Zvonimir et al. | 1986
    75
    Modular invariance of some fermionic theories and their bosonized versions
    Abouelsaood, Ahmed et al. | 1986
    83
    Newtonian N = 1 supergravity
    Castagnino, M. / Domenech, G. / Levinas, M. / Umerez, N. et al. | 1986
    87
    Topological mass term for gravity induced by matter
    Van Der Bij, J.J. / Pisarski, Robert D. / Rao, Sumathi et al. | 1986
    92
    On the No-go theorem of supersymmetry breaking
    Huang, Wung-Hong et al. | 1986
    95
    Nonabelian family symmetry and the origin of fermion masses and mixing angles
    Soldate, Mark / Reno, M.Hall / Hill, Christopher T. et al. | 1986
    103
    Technibaryonic missing mass and the germanium spectrometer bounds
    Nussinov, S. et al. | 1986
    105
    Indications of a light scalar in left-right symmetric models
    Mohapatra, Rabindra N. / Pal, Palash B. et al. | 1986
    109
    Magnetic monopoles, electric currents, and dirac strings
    Lipkin, Harry J. / Peshkin, Murray et al. | 1986
    115
    Interacting gauge fields of any spin and symmetry
    Koh, I.G. / Ouvry, S. et al. | 1986
    119
    Hard gamma emission from b-decay and the Higgs boson doublet model
    Ellis, R.G. / Joshi, G.C. / Matsuda, M. et al. | 1986
    125
    Non-abelian anomaly from lattice fermions
    Coste, A. / Korthals Altes, C. / Napoly, O. et al. | 1986
    130
    A Monte Carlo renormalization group study of the deconfinement transition in SU (2) gauge theory
    Das, Sumit R. / Kogut, J.B. et al. | 1986
    135
    Collective phenomena in QCD and the CP N model
    Davis, A.C. / Matheson, A.M. et al. | 1986
    141
    On the green function calculation for heavy quarkonium potential models
    Milstein, A.I. et al. | 1986
    146
    Saddle points and skyrmions in the Weinberg chiral model
    Kunz, J. / Masak, D. et al. | 1986
    153
    Strangeness evolution in the central region of a heavy-ion collision with transverse flow effects
    Kajantie, K. / Kataja, M. / Ruuskanen, P.V. et al. | 1986
    159
    Cross sections for the production of an arbitrary number of photons in electron-positron annihilation
    Kleiss, R. / Stirling, W.J. et al. | 1986
    164
    The effect of fragmentation models on the determination of αs from Hadron collider data
    Bengtsson, Mats / Sjöstrand, Torbjörn / Van Zijl, Maria et al. | 1986
    170
    A high-statistics study of ϒ-meson production in π-W reactions at 286 GeV/c
    Grossmann-Handschin, M. / Guanziroli, M. / Le Coultre, P. / Suter, H. / Telegdi, V.L. / Freudenreich, K. / Ereditato, A. / Strolin, P. / Bordalo, P. / Busson, Ph. et al. | 1986
    177
    The production and decay of tau leptons
    Adeva, B. / Ansari, S. / Becker, U. / Becker-Szendy, R. / Berdugo, J. / Boehm, A. / Branson, J.G. / Burger, J.D. / Capell, M. / Cerrada, M. et al. | 1986
    v
    Editorial Board
    | 1986

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