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Study of the reactions positive. pi. /sup +/p. -->. delta. /sup +//N*/sup +/ rho/sup +/ at 15. 7 GeV/c and. gamma. p. -->. delta. /sup + +/rho/sup -/ at 20. 0 GeV/c and a search for new, long-lived, neutral particles in. pi. /sup +/p interactions at 15. 7 GeV/c

Thesis/Dissertation ·
OSTI ID:5547516

The reactions ..pi../sup +/p ..-->.. ..pi../sup +/n..pi../sup +/..pi../sup 0/ and ..pi../sup +/p ..-->.. ..pi../sup +/p..pi../sup 0/..pi../sup 0/ are selected at 15.7 GeV/c incident ..pi../sup +/ momentum to isolate and study associated production of ..delta../sup +//N*/sup +/ baryons and rho/sup +/ mesons. The data were acquired at the Stanford Linear Accelerator Center 40 inch hybrid bubble chamber facility. A lead-glass wall was added to detect the photons from ..pi../sup 0/ decays. The data sample consisted of 40K two-prong events taken from a total of 666K pictures representing an untriggered sensitivity of 23 events/..mu..barn. The ..delta../sup +/rho/sup +/ production mechanism is studied by fitting the decay angular distributions to the spin density matrix element parameters in the Gottfried-Jackson reference frame. The reaction ..gamma..p ..-->.. ..delta../sup + +/rho/sup -/ is studied using a 20 GeV/c linearly polarized backscattered laser beam at the same SLAC detector facility. The data sample consisted of 130K three-prong events representing a sensitivity of 2.4 events/nanobarn. The photoproduction of ..delta../sup + +/rho/sup -/ is studied to determine the feasibility of using this reaction in conjunction with ..pi.. induced ..delta..rho production to measure the radiative width of the rho vector meson. The reactions /sup - +/p ..-->.. x/sup +/pX/sup 0/ and ..pi../sup +/p ..-->.. x/sup +/px/sup +/x/sup -/X/sup 0/ are studied at 15.7 GeV/c in a search for new, long-lived, neutral, particles. No evidence is found for any new particles and upper limits of 0.53 mbarns and 0.26 mbarns respectively are placed on their production cross sections.

Research Organization:
Duke Univ., Durham, NC (USA)
OSTI ID:
5547516
Country of Publication:
United States
Language:
English

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Related Subjects

645101 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
645104* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ANGULAR DISTRIBUTION
BARYON RESONANCES
BARYONS
BASIC INTERACTIONS
BOSONS
CROSS SECTIONS
DATA
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
GEV RANGE
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
LIMITING VALUES
LINEAR ACCELERATORS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
MULTIPLE PRODUCTION
N RESONANCES
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTON-PROTON INTERACTIONS
PION PLUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
POSTULATED PARTICLES
RESONANCE PARTICLES
STANFORD 20-GEV LINAC