τ Production and decay with the cello detector at petra

H. J. Behrend, L. Criegee, J. B. Dainton, J. H. Field, G. Franke, H. Jung, J. Meyer, V. Schröder, G. G. Winter, P. J. Bussey, C. Buttar, A. J. Campbell, D. Hendry, J. M. Scarr, I. O. Skillicorn, K. M. Smith, J. Ahme, V. Blobel, W. Brehm, M. FeindtH. Fenner, J. Harjes, J. H. Peters, O. Podobrin, H. Spitzer, W. D. Apel, J. Engler, G. Flügge, D. C. Fries, J. Fuster, P. Gabriel, K. Gamerdinger, P. Grosse-Wiesmann, M. Hahn, U. Hädinger, J. Hansmeyer, H. Küster, H. Müller, K. H. Ranitzsch, H. Schneider, R. Seufert, W. De Boer, G. Buschhorn, G. Grindhammer, B. Gunderson, C. Kiesling, R. Kotthaus, H. Kroha, D. Lüers, H. Oberlack, P. Schacht, S. Scholz, G. Shooshtari, W. Wiedenmann, M. Davier, J. F. Grivaz, J. Haissinski, P. Janot, V. Journé, D. W. Kim, F. Le Diberder, J. J. Veillet, K. Blohm, R. George, M. Goldberg, O. Hamon, F. Kapusta, L. Poggioli, M. Rivoal, G. D'Agostini, F. Ferrarotto, M. Iacovacci, B. Stella, G. Cozzika, Y. Ducros, G. Alexander, A. Beck, G. Bella, J. Grunhaus, A. Klatchko, A. Levy, C. Milsténe

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Abstract

The reaction e+e- →τ+τ- has been studied at centre of mass energies between 14.0 and 46.8 GeV with the CELLO detector at the PETRA e+e- collider. We present results for the cross section στ and the charge asymmetry Aτ. The results are in good agreement with the standard model. We have also measured the topological decay rates BR1, BR3 and BR5 for the inclusive decay of the τ lepton into one, three and five charge particles. The results confirm and improve earlier CELLO measurements at other energies. We find for the combined values at all energies BR1 = (84.9 ± 0.4 ± 0.3)%, BR3 = (15.0 ± 0.4 ± 0.3)% and BR5 = (0.16 ± 0.13 ± 0.04)%.

Original languageEnglish
Pages (from-to)163-172
Number of pages10
JournalPhysics Letters B
Volume222
Issue number1
DOIs
StatePublished - 11 May 1989

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