Search for a "top" threshold in hadronic e+e- annihilation at energies between 22 and 31.6 GeV

Ch Berger, H. Genzel, R. Grigull, W. Lackas, F. Raupach, A. Klovning, E. Lillestöl, E. Lillethun, J. A. Skard, H. Ackermann, G. Alexander, F. Barreiro, J. Bürger, L. Criegee, H. C. Dehne, R. Devenish, A. Eskreys, G. Flügge, G. Franke, W. GabrielCh Gerke, G. Knies, E. Lehmann, H. D. Mertiens, K. H. Pape, H. D. Reich, B. Stella, T. N.Ranga Swamy, U. Timm, W. Wagner, P. Waloschek, G. G. Winter, W. Zimmermann, O. Achterberg, V. Blobel, L. Boesten, H. Kapitza, B. Koppitz, W. Lührsen, R. Maschuw, R. van Staa, H. Spitzer, C. Y. Chang, R. G. Glasser, R. G. Kellogg, K. H. Lau, B. Sechi-Zorn, A. Skuja, G. Welch, G. T. Zorn, A. Bäcker, S. Brandt, K. Derikum, A. Diekmann, C. Grupen, H. J. Meyer, B. Neumann, M. Rost, G. Zech, T. Azemoon, H. J. Daum, H. Meyer, O. Meyer, M. Rössler, D. Schmidt, K. Wacker

Research output: Contribution to journalArticlepeer-review


Results on e+e- annihilation into hadrons at c.m. energies between 22 and 31.6 GeV are presented. The data were accumulated with the PLUTO detector at PETRA. The events are dominantly of the two-jet type. The value of the relative hadronic cross section R=3.88 ± 0.22 along with the details of the sphericity and thrust distribution rule out an open (tt̄) channel (Qt = 2 3) below 30 GeV. The inclusive muon results support the above conclusion.

Original languageEnglish
Pages (from-to)413-417
Number of pages5
JournalPhysics Letters B
Issue number3-4
StatePublished - 8 Oct 1979
Externally publishedYes


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