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 · Sun Jan 01 00:00:00 EST 1984

OSTI ID:5547516

Morgan, N K

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
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

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