Chronology of Milestone Events in Particle Physics - ALBRECHT 1987P
Chronology of Milestone Events in Particle Physics

ALBRECHT 1987P

ARGUS collaborations; Albrecht, H. et al.
Observation of Bo-o Mixing
Phys. Lett. 192B (1987) 245;

Reprinted in
Heavy Flavours, San Miniato (1987) 145.
Hadrons, Quarks and Gluons, Les Arcs (1987) 51.
R. N. Cahn and G. Goldhaber, The Experimental Foundations of Particle Physics, Cambridge Univ. Press (1991) 369.

Abstracts
Using the ARGUS detector at the DORIS II storage ring we have searched in three different ways for Bo-o mixing in (4S) decays. One explicitly mixed event, a decay (4S) Bo Bo, has been completely reconstructed. Futhermore, we observe a 4.0 standard deviation signal of 24.8 events with like-sign lepton pairs and 3.0 standard deviation signal of 4.1 events containing one reconstructed Bo-o and an additional fast l+( l)-. This leads to the conclusion that Bo-o mixing is substantial. For the mixing parameter we obtain r = 0.21 0.08.

Accelerator DESY-DORIS-II Detectors ARGUS

Related references
See also
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Particle Data Group, Review of Particle Properties, M. Aguilar-Benitez, Phys. Lett. 170B (1986) 1;
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Reactions
  e+ e (4S)
  (4S) Bo o
  (4S) B+ B
  (4S) Bo e+ X
  (4S) Bo + X
  (4S) o e X
  (4S) 2e X
  (4S) e X
  (4S) 2 X
  (4S) 2e+ X
  (4S) + e+ X
  (4S) 2+ X
  (4S) e e+ X
  (4S) + X
  (4S) e+ X
  (4S) + e X
  Bo o
  Bo D*(2010) +
  Bo D*(2010) + o
  Bo D*(2010) 2+
  Bo D*(2010) e+ e
  Bo D*(2010) +
  o D*(2010)+
  o D*(2010)+ o
  o D*(2010)+ + 2
  o D*(2010)+ e e
  o D*(2010)+
  D*(2010) o
  D*(2010)+ Do +
  Do K +
  Do K + o
  Do K 2+
  Do o +
  o K+
  o K+ o
  o K+ + 2
  o Ko +

Particles studied
  Bo mass
  o mass

Record comments
First evidence for the Bo-o mixing.
    
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