Angular distributions in radiative decays of charmonium [chi][sub 1] and [chi][sub 2] states formed in p[anti p] annihilations
Thesis/Dissertation
·
OSTI ID:7015346
A study of the angular distributions in the reactions p[anti p] [yields][chi][sub 1/2] [yields] J/[psi][gamma] [yields] e[sup +]e[sup [minus]] [gamma] is presented, using a sample of 2309 [chi][sub 2] events and 360 [chi][sub 1] events. The data were collected by Fermilab experiment E-760, which is the first high-statistics experiment studying charmonium states formed directly in p[anti p] annihilations. From the analysis of the angular distributions it is found that the helicity in the formation process p[anti p] [yields] [chi][sub 2] is mainly [+-]1, and that the radiative decays [chi][sub 1,2] [yields] J/[psi][gamma] are predominantly dipole transitions. The contribution of helicity zero in the [chi][sub 2] formation process is found to be B[sup 2][sub 0] = 0.01 [+-][sup 0.11][sub 0.12]. The normalized quadrupole amplitudes in the radiative decays are a[sub 2]([chi][sub 2]) = [minus]0.161[+-][sup 0.056][sub 0.061] and a[sub 2]([chi][sub 1]) = [minus]0.129 [+-] 0.059, and the octupole amplitude in the [chi][sub 2] decay is a[sub 3]([chi][sub 2]) = [minus]0.017[+-][sup 0.042][sub 0.040]. The results, which represent a significant improvement on the experimental knowledge of the angular distribution parameters, are compared with the measurements from previous experiments, and with theoretical predictions.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States)
- OSTI ID:
- 7015346
- Country of Publication:
- United States
- Language:
- English
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Angular distribution functions in the decays of [psi][prime] and [psi][prime][prime] directly produced in unpolarized [ital [bar p]p] collisions
Thesis/Dissertation
·
Thu Dec 31 23:00:00 EST 1992
·
OSTI ID:1425808
Study of the [chi][sub 1] and [chi][sub 2] states produced in [anti p]p annihilations in Fermilab Experiment 760
Thesis/Dissertation
·
Thu Dec 31 23:00:00 EST 1992
·
OSTI ID:7271463
Angular distribution functions in the decays of [psi][prime] and [psi][prime][prime] directly produced in unpolarized [ital [bar p]p] collisions
Journal Article
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Tue Jan 31 23:00:00 EST 1995
· Physical Review, D (Particles Fields); (United States)
·
OSTI ID:6643556
Related Subjects
662340 -- Hadron Interactions-- (1992-)
662350* -- Decays of Mesons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANNIHILATION
AXIAL VECTOR MESONS
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
CHARMONIUM
CHI1-3510 MESONS
CHI2-3555 MESONS
DECAY
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MESONS
NUCLEON-ANTINUCLEON INTERACTIONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PROTON-ANTIPROTON INTERACTIONS
QUARKONIUM
RADIATIVE DECAY
TENSOR MESONS
662350* -- Decays of Mesons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANNIHILATION
AXIAL VECTOR MESONS
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
CHARMONIUM
CHI1-3510 MESONS
CHI2-3555 MESONS
DECAY
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MESONS
NUCLEON-ANTINUCLEON INTERACTIONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PROTON-ANTIPROTON INTERACTIONS
QUARKONIUM
RADIATIVE DECAY
TENSOR MESONS