Tau-lepton production and decay at Petra energies

W. Bartel, L. Becker, D. Cords, R. Felst, D. Haidt, G. Knies, H. Krehbiel, P. Laurikainen, N. Magnussen, R. Meinke, B. Naroska, J. Olsson, D. Schmidt, P. Steffen, G. Dietrich, J. Hagemann, G. Heinzelmann, H. Kado, K. Kawagoe, C. KleinwortM. Kuhlen, A. Petersen, R. Ramcke, U. Schneekloth, G. Weber, K. Ambrus, S. Bethke, A. Dieckmann, E. Elsen, J. Heintze, K. H. Hellenbrand, Sachio Komamiya, J. Von Krogh, P. Lennert, H. Matsumura, H. Rieseberg, J. Spitzer, A. Wagner, C. K. Bowdery, A. J. Finch, F. Foster, G. Hughes, J. M. Nye, J. Allison, A. H. Ball, R. J. Barlow, J. Chrin, I. P. Duerdoth, T. Greenshaw, P. Hill, F. K. Loebinger, A. A. Macbeth, H. McCann, H. E. Mills, P. G. Murphy, K. Stephens, P. Warming, R. G. Glasser, J. A.J. Skard, S. R. Wagner, G. T. Zorn, S. L. Cartwright, D. Clarke, R. Marshall, R. P. Middleton, T. Kawamoto, T. Kobayashi, H. Takeda, M. Nozaki, T. Takeshita, S. Yamada

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Abstract

The production and decay of τ-pairs was studied with the JADE detector at PETRA at center-of-mass energies of 30 ≤√s ≤ 46.78 GeV. The total production cross section for τ-pairs agreed with QED predictions to order α3. Lower limits on QED cut-off parameters of Λ+ > 285 GeV and Λ- > 210 GeV at 95% confidence level were ontained. The decay branching fractions into one and three charged particles were determined to be (86.1 ± 0.5 ± 0.9)% and (13.6±0.5 ±0.80)%. In the angular distributions a forward-backward asymmetry was observed, from which the axial-vector weak charge to the τ was determined to be aτ = -0.74 ± 0.22 in agreement with the standard model. An analysis of the process e+e- → τ+τ-γ showed agreement with QED calculations to O(α3).

Original languageEnglish
Pages (from-to)188-196
Number of pages9
JournalPhysics Letters B
Volume161
Issue number1-3
DOIs
Publication statusPublished - 1985 Oct 24
Externally publishedYes

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Bartel, W., Becker, L., Cords, D., Felst, R., Haidt, D., Knies, G., Krehbiel, H., Laurikainen, P., Magnussen, N., Meinke, R., Naroska, B., Olsson, J., Schmidt, D., Steffen, P., Dietrich, G., Hagemann, J., Heinzelmann, G., Kado, H., Kawagoe, K., ... Yamada, S. (1985). Tau-lepton production and decay at Petra energies. Physics Letters B, 161(1-3), 188-196. https://doi.org/10.1016/0370-2693(85)90634-3