Exclusive τ decays with the CELLO detector at PETRA

H. J. Behrend*, L. Criegee, J. H. Field, G. Franke, H. Jung, J. Meyer, O. Podobrin, V. Schröder, G. G. Winter, P. J. Bussey, A. J. Campbell, D. Hendry, S. Lumsdon, I. O. Skillicorn, J. Ahme, V. Blobel, W. Brehm, M. Feindt, H. Fenner, J. HarjesJ. Köhne, J. H. Peters, 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, W. Wiedenmann, M. Davier, J. F. Grivaz, J. Haissinski, 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, G. Shooshtari, B. Stella, G. Cozzika, Y. Ducros, G. Alexander, A. Beck, G. Bella, J. Grunhaus, A. Klatchko, A. Levy, C. Milsténe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


We present high precision results from an analysis of all major τ branching ratios, determined simultaneously in the same experiment. The results are based on 6064 τ decays observed at {Mathematical expression}, using the CELLO detector at PETRA. The sum of the measured exclusive branching ratios saturates the total τ decay width. In a comparison with the topological branching ratios measured recently by CELLO, the sums of the respective exclusive branching ratios are found to saturate the inclusive fractions. Our results are in good general agreement with existing measurements. However, the decay fractions for τ-→π-π+π-vτ, and π-→π-π0π0vτ are larger than the present world averages. All measured branching ratios are in good agreement with the expectations from a standard τ lepton.

Original languageEnglish
Pages (from-to)537-546
Number of pages10
JournalEuropean Physical Journal C
Issue number4
StatePublished - Dec 1990


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