Topology of the Υ-decay

  • PLUTO Collaboration
  • Ch. Berger
  • W. Lackas
  • F. Raupach
  • G. Alexander
  • J. Bürger
  • L. Criegee
  • H. C. Dehne
  • R. Devenish
  • G. Flügge
  • G. Franke
  • Ch. Gerke
  • G. Knies
  • E. Lehmann
  • B. Stella
  • U. Timm
  • W. Wagner
  • Waloschek
  • G. G. Winter
  • W. Zimmermann
  • O. Achterberg
  • V. Blobel
  • L. Boesten
  • H. Kapitza
  • B. Koppitz
  • W. Lührsen
  • H. Spitzer
  • R. van Staa
  • A. Bäcker
  • S. Brandt
  • K. Derikum
  • C. Grupen
  • H. J. Meyer
  • B. Neumann
  • G. Zech
  • H. J. Daum
  • H. Meyer
  • O. Meyer
  • M. Rössler
  • K. Wacker
Article

Abstract

Multihadron events resulting frome+e annihilation at the Υ-resonance are analysed with respect to lowest order QCD which predicts a dominant Υ decay into three vector gluons. Smearing effects due to the gluon fragmentation are so large, however, that no clear 3-jet structure or flatness is expected in the hadron final state. Instead, Monte Carlo simulations predict event structures with thrust and triplicity distributions distinctly different from those of two quark-jet and of phase space like decay mechanisms. The data are in perfect agreement with the 3-vector gluon decay as predicted by QCD and exclude dominantly phase space like or 2-quark jet decays. Also, the decay into scalar gluons is excluded by the data. An upper limit for the Υ-decay into one photon and two gluons is obtained.

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Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • PLUTO Collaboration
  • Ch. Berger
    • 1
  • W. Lackas
    • 1
  • F. Raupach
    • 1
  • G. Alexander
    • 2
  • J. Bürger
    • 2
  • L. Criegee
    • 2
  • H. C. Dehne
    • 2
  • R. Devenish
    • 2
  • G. Flügge
    • 2
  • G. Franke
    • 2
  • Ch. Gerke
    • 2
  • G. Knies
    • 2
  • E. Lehmann
    • 2
  • B. Stella
    • 2
  • U. Timm
    • 2
  • W. Wagner
    • 2
  • Waloschek
    • 2
  • G. G. Winter
    • 2
  • W. Zimmermann
    • 2
  • O. Achterberg
    • 3
  • V. Blobel
    • 3
  • L. Boesten
    • 3
  • H. Kapitza
    • 3
  • B. Koppitz
    • 3
  • W. Lührsen
    • 3
  • H. Spitzer
    • 3
  • R. van Staa
    • 3
  • A. Bäcker
    • 4
  • S. Brandt
    • 4
  • K. Derikum
    • 4
  • C. Grupen
    • 4
  • H. J. Meyer
    • 4
  • B. Neumann
    • 4
  • G. Zech
    • 4
  • H. J. Daum
    • 5
  • H. Meyer
    • 5
  • O. Meyer
    • 5
  • M. Rössler
    • 5
  • K. Wacker
    • 5
  1. 1.I. Physikalisches Institut der RWTHAachenFederal Republic of Germany
  2. 2.DESYDeutsches ElektronensynchrotronHamburgFederal Republic of Germany
  3. 3.II. Institut für Experimentalphysik der UniversitätHamburgFederal Republic of Germany
  4. 4.Universität-GesamthochschuleSiegenFederal Republic of Germany
  5. 5.Universität-GesamthochschuleWuppertalFederal Republic of Germany

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