Chronology of Milestone Events in Particle Physics - FINOCCHIARO 1980
Chronology of Milestone Events in Particle Physics

FINOCCHIARO 1980

Finocchiaro, G.; Giannini, G.; Lee-Franzini, J.; Schamberger, R.D.; Sivertz, M.; Spencer, L.J.; Tuts, P.M.; Bohringer, T.; Costantini, F.; Dobbins, J.; Franzini, P.; Han, K.; Herb, S.W.; Kaplan, D.M.; Lederman, L.M.; Mageras, G.; Peterson, D.; Rice, E.; Yoh, J.K.; Levman, G.;
Observation of the Υ(4S) at CESR
Phys. Rev. Lett. 45 (1980) 222;

Abstracts
During an energy scan at the Cornell Electron Storage Ring, with use of the Columbia University-Stony Brook NaI detector, an enhancement in σ(e+ e– → hadrons) is observed at center-of-mass energy ~ 10.55 GeV. The mass and leptonic width of this state (Υ''') suggest that it is the 43S1 bound state of the b quark and its antiquark. After applying to the data a cut in a (pseudo) thrust variable, the natural width is measured to be Γ = 12.6 ± 6.0 MeV, indicating that the Υ''' is above threshold for B anti-B production.

Accelerator CESR Detectors CUSB

Related references
More (earlier) information appears in
T. Bohringer et al., Phys. Rev. Lett. 44 (1980) 1111;
Analyse data from
D. Andrews et al., Phys. Rev. Lett. 45 (1980) 219;
S. W. Herb et al., Phys. Rev. Lett. 39 (1977) 252;
W. R. Innes et al., Phys. Rev. Lett. 39 (1977) 1240;
F. H. Heimlich et al., Phys. Lett. 86B (1979) 399;
C. Berger et al., Phys. Lett. 78B (1978) 176;
C. Berger et al., Phys. Lett. 82B (1979) 449;
J. K. Bienlein et al., Phys. Lett. 78B (1978) 360;
C. W. Darden et al., Phys. Lett. 78B (1978) 364;
C. W. Darden et al., Phys. Lett. 76B (1978) 246;
D. Andrews et al., Phys. Rev. Lett. 44 (1980) 1108;
C. Berger et al., Phys. Lett. 76B (1978) 243;

Reactions
  e+ e– 2hadron (hadrons) 9.390-10.60 GeV (Ecm) cs
  Υ(4S) 2hadron (hadrons)

Particles studied
  Υ(4S) ex, mass, w, pw

Record comments
Another evidence for the Υ(4S).
    
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