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Determination of α s in first and second order QCD frome + e − annihilation into hadrons

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Zeitschrift für Physik C Particles and Fields

Abstract

Multihadron events produced bye + e − annihilation at a c.m. energy of 34.6 GeV have been used to determine α s . The predictions of 1 st and 2nd order QCD models with independent jet and string fragmentation have been compared to a large variety of kinematic variables such as event shapes, transverse momentum spectra, jet masses, 3-cluster thrust and the asymmetry of energy-energy correlations. The value of α s has been found to depend on the variables used, on the fragmentation model and on the treatment of soft gluons in the 2nd order QCD calculation. Within the models considered α s has been found in complete 2nd order QCD to lie between 0.12 and 0.23.

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Author information

Author notes

  1. H. G. Sander

    Present address: CERN, Geneva, Switzerland

  2. L. Köpke

    Present address: University of California, Santa Cruz, CA, USA

  3. A. Eskreys

    Present address: Institute of Nuclear Physics, Cracow, Poland

  4. R. J. Nowak & T. Tymieniecka

    Present address: Warsaw University, Poland

  5. G. Yekutieli

    Present address: Weizmann Institute, Rehovot, Israel

  6. Ch. Xiao

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

  7. W. A. T. Wan Abdullah

    Present address: University Malaya, Kuala Lumpur

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, H. G. Sander, 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, L. Köpke, H. Kolanoski, H. Kück, V. Mertens & R. Wedemeyer

  3. Deutsches Elektronen-Synchrotron DESY, D-2000, Hamburg, Germany

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

  4. 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

  5. Department of Physics, Imperial College, SW7 2BZ, London, England

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

  6. Department of Nuclear Physics, University, OX1 3RH, Oxford, England

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

  7. Rutherford Appleton Laboratory, Chilton, OX1 OQX, Didcot, Oxon, England

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

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

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

  9. Weizmann Institute, Rehovot, Israel

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

  10. Department of Physics, University of Wisconsin, 53706, Madison, WI, USA

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

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  1. M. Althoff
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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 DEAC-02-76ER00881

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TASSO Collaboration., Althoff, M., Braunschweig, W. et al. Determination of α s in first and second order QCD frome + e − annihilation into hadrons. Z. Phys. C - Particles and Fields 26, 157–174 (1984). https://doi.org/10.1007/BF01421751

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  • DOI: https://doi.org/10.1007/BF01421751

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