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The production and decay of Tau leptons ine + e − annihilation at PETRA energies

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Zeitschrift für Physik C Particles and Fields

Abstract

We have observed τ pair production at average CM energies of 13.9, 22.3, 34.5 and 43.1 GeV. The cross-sections are consistent with QED, the cut off parameters beingΛ +>161 GeV andΛ −169 GeV (95% CL). The topological branching fraction of the τ to 1 charged particle,B 1, is 0.847±0.011 (stat) +0.016−0.013 (syst) and no decays to 5 charged particles were observed resulting inB 5<0.007 (95% CL). Within the 3 charged track final stateB(τ −→π − π + π − v)/(B(τ −→π − π + π − v)+B(τ −→π − π + π − π 0 v))=0.37 +0.35−0.20

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Author information

Author notes

  1. A. J. Campbell

    Present address: University of Glasgow, UK

  2. P. L. Woodworth

    Present address: Institute of Oceanographic Sciences, Bidston, Merseyside, UK

  3. Ch. Xiao

    Present address: University of Science and Technology of China, Hefei

Authors and Affiliations

  1. I. Physikalisches Institut der RWTH, D-5100, Aachen, Germany

    M. Althoff, W. Braunschweig, F. J. Kirschfink, K. Lübelsmeyer, H. -U. Martyn, P. Rosskamp, D. Schmitz, H. Siebke & W. Wallraff

  2. Physikalisches Institut der Universität, D-5300, Bonn, Germany

    J. Eisenmann, H. M. Fischer, H. Hartmann, A. Jocksch, G. Knop, H. Kolanoski, H. Kück, V. Mertens & R. Wedemeyer

  3. H.H. Wills Physics Laboratory, University of Bristol, BS8 1TL, Bristol, UK

    B. Foster

  4. Deutsches Elektronen-Synchrotron DESY, D-2000, Hamburg 50, Germany

    A. Eskreys, K. Gather, M. Hildebrandt, H. Hultschig, P. Joos, U. Kötz, H. Kowalski, A. Ladage, B. Löhr, D. Lüke, P. Mättig, D. Notz, R. J. Nowak, J. Pyrlik, E. Ronat, M. Rushton, W. Schütte, D. Trines, T. Tymieniecka, G. Wolf, G. Yekutieli & Ch. Xiao

  5. II. Institut für Experimentalphysik der Universität, D-2000, Hamburg, Germany

    R. Fohrmann, E. Hilger, T. Kracht, H. L. Krasemann, P. Leu, E. Lohrmann, D. Pandoulas, G. Poelz, K. U. Pösnecker & B. H. Wiik

  6. Department of Physics, Imperial College, SW7 2BZ, London, UK

    R. Beuselinck, D. M. Binnie, A. J. Campbell, P. J. Dornan, D. A. Garbutt, C. Jenkins, T. D. Jones, W. G. Jones, J. McCardle, J. K. Sedgbeer, J. Thomas & W. A. T. Wan Abdullah

  7. Department of Nuclear Physics, University, OX1 3RH, Oxford, UK

    K. W. Bell, M. G. Bowler, P. Bull, R. J. Cashmore, P. E. L. Clarke, P. Dauncey, R. Devenish, P. Grossmann, C. M. Hawkes, S. L. Lloyd, D. J. Mellor & C. Youngman

  8. Rutherford Appleton Laboratory, Chilton, OX11 0QX, Didcot, Oxon, UK

    G. E. Forden, J. C. Hart, J. Harvey, D. K. Hasell, D. H. Saxon & P. L. Woodworth

  9. Fachbereich Physik der Universität-Gesamthochschule, D-5900, Siegen, Germany

    F. Barreiro, S. Brandt, M. Dittmar, M. Holder, G. Kreutz & B. Neumann

  10. Welzmann Institute, Rehovot, Israel

    E. Duchovni, Y. Eisenberg, U. Karshon, G. Mikenberg, R. Mir, D. Revel & A. Shapira

  11. Department of Physics, University of Wisconsin, 53706, Madison, W1, USA

    G. Baranko, A. Caldwell, M. Cherney, J. M. Izen, M. Mermikides, S. Ritz, G. Rudolph, D. Strom, M. Takashima, H. Venkataramania, E. Wicklund, Sau Lan Wu & G. Zobernig

Authors
  1. M. Althoff
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  2. W. Braunschweig
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  4. K. Lübelsmeyer
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  5. H. -U. Martyn
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  10. J. Eisenmann
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  11. H. M. Fischer
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  12. H. Hartmann
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  13. A. Jocksch
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  14. G. Knop
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  15. H. Kolanoski
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  16. H. Kück
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  17. V. Mertens
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  18. R. Wedemeyer
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  19. B. Foster
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  20. A. Eskreys
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  27. A. Ladage
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  29. D. Lüke
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  30. P. Mättig
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  31. D. Notz
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  33. J. Pyrlik
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  37. D. Trines
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  39. G. Wolf
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  41. Ch. Xiao
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  42. R. Fohrmann
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  98. J. M. Izen
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  106. Sau Lan Wu
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  107. G. Zobernig
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TASSO Collaboration

Additional information

On leave from Institute of Nuclear Physics, Cracow, Poland

On leave from Warsaw University, Poland

On leave from Weizmann Institute, Rehovot, Israel

On leave from Universiti Malaya, Kuala Lumpur

On leave from Rutherford Appleton Laboratory, Chilton, UK

Supported by the Deutsches Bundesministerium für Forschung und Technologie

Supported by the UK Science and Engineering Research Council

Supported by the Minerva Gesellschaft für Forschung mbH

Supported by the US Department of Energy contract DE-AC02-76R00881

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TASSO Collaboration., Althoff, M., Braunschweig, W. et al. The production and decay of Tau leptons ine + e − annihilation at PETRA energies. Z. Phys. C - Particles and Fields 26, 521–530 (1985). https://doi.org/10.1007/BF01551794

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