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 ee = (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 (1S) 9.2-9.48 GeV (Ecm) cs
  e+ e mult[] 9.2-9.48 GeV (Ecm) mult
  e+ e mult[charged] 9.2-9.48 GeV (Ecm) mult

Particles studied
  (1S) mass, w

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