Study of the reaction. pi. /sup +/p. --> pi. p/sup 0/. pi. /sup 0/ at 15. 7 GeV/c

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5072470

Clark, R K

From a sample of 30,400 two prong events the reaction ..pi../sup +/p..--> pi../sup +/p..pi../sup 0/..pi../sup 0/ at 15.7 GeV/c is studied. The data were taken at the SLAC 40'' hybrid bubble chamber with a segmented lead-glass wall placed downstream of the bubble chamber to detect photons and to trigger the bubble chamber upon a deposition of 8 GeV or more of energy. With information from the wall it is possible to reconstruct constrained events with two neutral pions. The experimental setup and the use of the wall in reconstructing the ..pi../sup 0/'s is described. Invariant masses are presented including the ..pi../sup 0/..pi../sup 0/ mass up to about 4 GeV. No new high mass neutral meson is seen. A van Hove analysis is performed, showing considerable pion diffractive events and production of ..delta../sup + +/(1232), f/sup 0/(1270), and rho(770). Events with a ..delta../sup + +/(1232) present are isolated and investigated. The cross section for the reaction ..pi../sup +/p..--> delta../sup + +/f/sup 0/(f/sup 0/..--> pi../sup 0/..pi../sup 0/) is determined to be 25.8 +/- 3.4 microbarns. A moments analysis and amplitude analysis are performed, showing that only S and D wave contributed to the cross section. There is no evidence for the narrow epsilon(700), nor for the recently reported f'(1800). An OPE model calculation is made and compared with data using phase shifts measurements from other experiments. When using phase shifts form Biswas (1981) the model underestimated the cross section below m(..pi../sup 0/..pi../sup 0/) = 1 GeV, while with phase shifts from Estabrooks and Martin (1974) the model is consistent with the data.

• Research Organization: Florida State Univ., Tallahassee (USA)
• OSTI ID: 5072470
• Country of Publication: United States
• Language: English

Related Subjects

645104* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYON RESONANCES
BARYONS
BOSON-EXCHANGE MODELS
BOSONS
CROSS SECTIONS
DATA
DELTA-1236 RESONANCES
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
F-1260 RESONANCES
FERMIONS
GEV RANGE
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
LINEAR ACCELERATORS
MATHEMATICAL MODELS
MESON RESONANCES
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
MULTIPLE PRODUCTION
N RESONANCES
NUCLEONS
NUMERICAL DATA
OBE MODEL
OPE MODEL
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PERIPHERAL MODELS
PION PLUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PIONS
PIONS PLUS
PROTONS
PSEUDOSCALAR MESONS
RESONANCE PARTICLES
RHO-765 RESONANCES
STANFORD 20-GEV LINAC
TENSOR MESONS
VECTOR MESONS