A STUDY OF K MESONS IN ANTIPROTON-PROTON ANNIHILATION (thesis)
A study is made of K meson production in p-p-bar annihilation. The data consist of 287 KK-bar n pi annihilation events, with observed K meson decays. The experiment is performed in a liquid hydrogen bubble chamber at p-bar momenta of 1.61 and 1.99 Bev/c. The total numbers of antiproton interactions in the sample are 14,562 plus or minus 300 and 2200 plus or minus 300 at each of the two momenta, respectively. Many of the events fit two or more hypotheses. Ambiguities as to the multiplicity of the final state are resolved by analysis of ideograms of the square of the missing mass. Ambiguities remain as to which particle is the second K meson. Half of the events fit only one hypothesis and are unambiguous. Fermi statistical model and phase space calculations are performed using the Lorentz invariant phase space. The multiplicity distribution for all pion annihilation agrees with a Fermi statistical model. This model predicts pion multiplicities associated with a KK-bar pair in agreement with the experimental results. The average multiplicities for KK-bar n pi annihilation, and the fraction of the annihilation yielding KK-bar n pi final states are observed at 1.61 and 1.99 Bev/c. These fractions are in agreement with the Fermri statistical model. The multiplicities and fraction of annihilation into KK-bar n pi at lower energies also agree with predictions of the Fermimodel. The momentum spectra of the K and pi mesons and the angular distributions between pairs of particles in the antiproton-proton center of mass system are in agreement with the predictions of phase space for each multiplicity of the final state (three-, four-, five-, and six-body). The angular distributions of the K and pi mesons relative to the antiproton direction deviate from isotropy. The distribution in the effective mass of KK-bar pairs is consistent with the predictions of phase space. However, the mass distnibutions of K pi (or K-bar pi ) pairs deviate from phase space and show effects consistent with K-bar pi and K pi resonances. (auth)
- Research Organization:
- California. Univ., Berkeley. Lawrence Radiation Lab.
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-15-026834
- OSTI ID:
- 4000364
- Report Number(s):
- UCRL-9597
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANGULAR DISTRIBUTION
ANISOTROPY
ANNIHILATION
ANTIKAONS
ANTIMESONS
ANTIPROTONS
BUBBLE CHAMBERS
DECAY
DISTRIBUTION
ENERGY RANGE
FERMIONS
GEV RANGE
HYDROGEN
INTERACTIONS
KAONS
LORENTZ TRANSFORMATIONS
MANY BODY PROBLEM
MATHEMATICS
MOMENTUM
MULTIPLICITY
NEUTRONS
NUMERICALS
PARTICLE TRACKS
PHASE SPACE
PIONS
PROTONS
RELATIVITY THEORY
RESONANCE
SPECTRA
STATISTICS