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Total cross section for hadron production bye + e − annihilation between 9.4 and 9.5 GeV

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Zeitschrift für Physik C Particles and Fields

Abstract

The total cross section fore + e − annihilation into hadrons for center of mass energies from 9.4 to 9.5 GeV has been measured with the nonmagnetic DESY-Heidelberg detector at DORIS. A value ofR=σhad/σµµ=3.8±0.7 for the continuum region around the Υ (9.46) resonance has been determined. The ratioΓ ee Γ had/Γ tot of electronic, hadronic and total widths has been reevaluated to be (1.00±0.23) keV for the Υ resonance and (0.37±0.16) keV for the Υ′. In addition, a search for directly produced pohotons from Υ decays of the type Υ→γ+gluon+gluon has been performed. The Υ decay into muon pairs has also been searched for.

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Author notes

  1. B. Pietrzyk

    Present address: CERN, Geneva, Switzerland

  2. B. Niczyporuk

    Present address: Inst. of Nuclear Physics, Cracow, Poland

  3. H. Vogel

    Present address: Phys. Inst. der Universität Erlangen, FRG

Authors and Affiliations

  1. Physikalisches Institut der Universität, D-6900, Heidelberg, Germany

    P. Bock, G. Heinzelmann & B. Pietrzyk

  2. Max-Planck-Institut für Physik, D-8000, München, Germany

    G. Blanar, W. Blum, H. Dietl, E. Lorenz & R. Richter

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

    J. K. Bienlein, M. Leissner, B. Niczyporuk, C. Rippich, M. Schmitz & H. Vogel

  4. I. Institut für Experimentalphysik, Universität, D-2000, Hamburg, Germany

    F. H. Heimlich, P. Lezoch & U. Strohbusch

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  1. P. Bock
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  2. G. Heinzelmann
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  4. G. Blanar
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  6. H. Dietl
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  7. E. Lorenz
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  9. J. K. Bienlein
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  15. F. H. Heimlich
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Bock, P., Heinzelmann, G., Pietrzyk, B. et al. Total cross section for hadron production bye + e − annihilation between 9.4 and 9.5 GeV. Z. Phys. C - Particles and Fields 6, 125–129 (1980). https://doi.org/10.1007/BF01588838

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  • DOI: https://doi.org/10.1007/BF01588838

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