Topology of the Υ-decay

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. AchterbergV. 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

Research output: Contribution to journalArticlepeer-review

Abstract

Multihadron events resulting from e+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.

Original languageEnglish
Pages (from-to)101-114
Number of pages14
JournalEuropean Physical Journal C
Volume8
Issue number2
DOIs
StatePublished - Jun 1981
Externally publishedYes

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