Chronology of Milestone Events in Particle Physics - DARDEN 1978
Chronology of Milestone Events in Particle Physics

DARDEN 1978

Darden, C.W.; Hasemann, H.; Krolzig, A.; Schmidt-Parzefall, W.; Schroder, H.; Schulz, H.D.; Selonke, F.; Steinmann, E.; Wurth, R.; Hofmann, W.; Wegener, D.; Albrecht, H.; Schubert, K.R.; Bockmann, P.; Jonsson, L.;
Observation of a Narrow Resonance at 9.46 GeV in Electron Positron Annihilations
Phys. Lett. 76B (1978) 246;

Reprinted in
J. L. Rosner, New Particles. Selected Reprints, Stony Brook, American Association of Physics Teachers (1981) 109.

Abstracts
We observe a narrow resonance in the reaction e+e– → hadrons using the DASP detector at the DORIS storage ring. The mass is found to be (9.46 ± 0.01) GeV and the observed width is compatible with the storage ring resolution of ± 8 MeV. The energy-integrated cross section results in an electronic width Γee = (1.3 ± 0.4) keV.

Accelerator DESY-DORIS-II Detectors DASP

Related references
See also
S. W. Herb et al., Phys. Rev. Lett. 39 (1977) 252;
J. Ellis, M. K. Gaillard, D. V. Nanopoulos, and S. Rudaz, Nucl. Phys. B131 (1977) 285;
E. Eichten and K. Gottfried, Phys. Lett. 66B (1977) 286;
DASP Coll., R. Brandelik et al., Phys. Lett. 67B (1977) 243;
J. D. Jackson and D. L. Scharre, Nucl. Instr. and Meth. 128 (1975) 13;
DASP Coll., R. Brandelik et al., Phys. Lett. 56B (1975) 491;

Reactions
  e+ e– 2hadron (hadrons) 9.2-9.48 GeV (Ecm) cs
  e+ e– Υ(1S) 9.2-9.48 GeV (Ecm) cs
  e+ e– mult[γ] 9.2-9.48 GeV (Ecm) mult
  e+ e– mult[charged] 9.2-9.48 GeV (Ecm) mult

Particles studied
  Υ(1S) mass, w

Record comments
Another confirmation of the Υ(1S) resonance.
    
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