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Charge conjugation symmetry in proton--antiproton interactions at 5. 4 GeV energy. [5. 4 GeV, asymmetry]

Technical Report ·
DOI:https://doi.org/10.2172/5065371· OSTI ID:5065371
The charge conjugation symmetry of the reaction anti pp- ..-->.. ..pi../sup +-/ + X was checked at radical s = 5.4 GeV. The measurement was made with a double arm spectrometer, with each arm triggered independently. Each spectrometer arm had an acceptance of 15 millisteradians and subtended an angular range of 16 to 20/sup 0/ in the lab, 77 to 91/sup 0/ in the pion center of mass system (CMS). The asymmetry (N/sup +/ - N/sup -/)/(N/sup +/ + N/sup -/) was determined at 90/sup 0/ CMS over a P/sub t/ range of .5 to 2.7 GeV/c. Corrections were made for target empty, for pions in the incident beam, and for particle misidentification in the spectrometer. The resulting symmetry was .0084 +- .0090; consistent with zero. The asymmetry introduced by differential pion absorption in the spectrometer was estimated to be .0021. In the P/sub t/ regions of .48 to .67 to 1.00 and 1.00 to 2.7 GeV/c, the asymmetries were .0037 +- .0115, .0178 +- .0145, and -.0025 +- .0311, respectively. The corresponding limits on the amplitude ratio V = Re (C-nonconserving amplitude)/(C-conserving amplitude) are one half of the asymmetry limits.
Research Organization:
Princeton Univ., N.J. (USA). Elementary Particles Lab.
Sponsoring Organization:
USDOE
DOE Contract Number:
EY-76-C-02-3072
OSTI ID:
5065371
Report Number(s):
COO-3072-91
Country of Publication:
United States
Language:
English

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Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ABSORPTION
ASYMMETRY
BARYON-BARYON INTERACTIONS
BOSONS
BOUNDARY CONDITIONS
C INVARIANCE
CORRECTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
GEV RANGE
GEV RANGE 01-10
HADRON-HADRON INTERACTIONS
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
INVARIANCE PRINCIPLES
LIMITING VALUES
MESONS
NUCLEON-ANTINUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PIONS
PROTON-ANTIPROTON INTERACTIONS
PSEUDOSCALAR MESONS