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

CALICCHIO 1980

BEBC TST neutrino collaboration; Calicchio, M. et al.
First Observation of the Production and Decay of the c(2455)+
Phys. Lett. 93B (1980) 521;

Abstracts
An event with the decay chain c(2455)+ c+ o, c+ K p +, has been observed in an exposure of BEBC, equipped with a track sensitive target, to the wide band neutrino beam from the SPS at CERN. The event has a unique three constraint kinematic fit to the S = -Q reaction p p K 2+ o with both gammas from the o decay detected. The proton and other final state particles are identified. The masses are M(c+) = 2290 3 MeV/c2, M(SIGMA/C+ ) = 2457 4 MeV/c2 and M(SIGMA/C+ )-M(c+) = 168 3 MeV/c2. Including other data one obtains M(SIGMA/C++ )-M(SIGMA/C+ ) = 0 4 MeV/c2.

Accelerator CERN-SPS Detectors HBC-BEBC-TST-HYB

Related references
See also
E. G. Cazzoli et al., Phys. Rev. Lett. 34 (1975) 1125;
B. Knapp et al., Phys. Rev. Lett. 37 (1976) 882;
A. M. Cnops et al., Phys. Rev. Lett. 42 (1979) 197;
W. Lockman et al., Phys. Lett. 85B (1979) 443;
V. Flaminio et al., Compilation of cross-sections, preprint CERN-HERA 79-01, 79-02 (1979);
G. S. Abrams et al., Phys. Rev. Lett. 44 (1980) 10;
C. Baltay et al., Phys. Rev. Lett. 42 (1979) 1721;
K. L. Giboni et al., Phys. Lett. 85B (1979) 437;
R. Beuselinck et al., Nucl. Instr. and Meth. 154 (1978) 445;
D. Drijard et al., Phys. Lett. 85B (1979) 452;

Reactions
  p p K 2+ o 30-300 GeV (Plab) mass
  c+ p K +
  c(2455)+ p K + o

Particles studied
  c(2455)+ ex, mass
  c+ mass

Record comments
First evidence for the c(2455)+.
    
  New Comments List of Comments