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Measurement of the analyzing power in pion-proton charge-exchange scattering from 547 to 687 MeV/c

Thesis/Dissertation ·
OSTI ID:6362290
The analyzing power in ..pi../sup -/p ..-->.. ..pi../sup 0/n has been measured at 547, 586, 625, 657, and 687 MeV/c. The experiment made use of counters and chambers to detect the recoil neutrons in coincidence with one of the photons from the decay of the scattered ..pi../sup 0/. A uniform angular distribution covering the interval -0.9 less than or equal to cos theta/sub cm/ less than or equal to +0.9 was measured for nine or ten points simultaneously at each momentum. The results have a statistical uncertainty as low as 0.03 in the forward direction, higher in the backward direction, and a systematic uncertainty of 3%. A comparison is made with the predictions of three recent partial wave analyses (PWA's); none of the PWA's is consistent with the measured distribution at 687 MeV/c. The transversity up and transversity down cross sections are calculated and used to test isospin symmetry in the ..pi..N system. No evidence for a violation of isospin is found.
Research Organization:
California Univ., Los Angeles (USA)
OSTI ID:
6362290
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
ANALYZING POWER
ANGULAR DISTRIBUTION
BARYONS
BASIC INTERACTIONS
BOSONS
CHARGE-EXCHANGE INTERACTIONS
COINCIDENCE METHODS
COUNTING TECHNIQUES
CROSS SECTIONS
DATA
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY DEPENDENCE
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
ISOSPIN
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
MEV RANGE
MEV RANGE 100-1000
NEUTRONS
NUCLEONS
NUMERICAL DATA
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PION MINUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
STRONG INTERACTIONS