Study of K-p interactions at 6. 5 GeV/c: final states with two charged particles and a visible. lambda

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5445265

Riemer, R L

We present in this dissertation a study of K-p interactions at 6.5 GeV/c using the Argonne 12-foot bubble chamber. The study is based on the analysis of final states with two charged particles and a visible vee resulting from the decay of a ..lambda... Production of ..lambda..rho/sup 0/, ..lambda omega.., and ..lambda..phi final states was studied: large backward hemisphere production was seen for ..lambda..rho/sup 0/ and ..lambda omega.. events, while no backward hemisphere events were seen for ..lambda..phi events in accordance with Zweig's rule. The overall hyperon polarization for backward hemisphere ..lambda..rho/sup 0/ and ..lambda omega.. events is found to be opposite in sign from that for the forward hemisphere. We detected smaller signals for the ..sigma../sup 0/rho/sup 0/ and ..sigma../sup 0/phi events. No backward hemisphere production was seen for the latter final state. The overall hyperon polarizations for ..sigma../sup 0/phi and ..sigma../sup 0/rho/sup 0/ events were opposite in sign from ..lambda..phi and ..lambda..rho/sup 0/ events. The ..sigma../sup 0/ final states apear to have little unnatural parity exchange compared to the ..lambda.. events. A clear signal was seen for ..lambda..eta' production in the ..lambda pi../sup +/..pi../sup -/eta channel. We also noted a small signal for ..lambda..eta events in the ..lambda pi../sup +/..pi../sup -/..pi../sup 0/ channel. We have also analyzed ..lambda..f, ..lambda..f, and ..sigma../sup 0/f production. In contrast to vector meson production, these tensor meson final states showed a dominant unnatural parity helicity 0 exchange contribution for peripheral events. Small natural parity helicity 1 contributions were present, with little helicity 2 contributions. We analyzed the ..sigma../sup +/(1385)..pi../sup -/ final state from the ..lambda pi../sup +/..pi../sup -/ channel. The predictions of te Stodolsky-Sakurai and additive quark models give identical predictions for the density matrix elements, ans we see fair agreement of these models with the data. We have also examined the ..lambda pi../sup +/..pi../sup -/..pi../sup 0/ channel for associated production of ..sigma../sup +/ /sup 0 -/(1385)p/sup -/ /sup 0/ /sup +/.

• Research Organization: Kansas Univ., Lawrence (USA)
• OSTI ID: 5445265
• 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
BARYONS
BOSONS
COMPOSITE MODELS
CROSS SECTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
ETA MESONS
F-1260 RESONANCES
FERMIONS
GEV RANGE
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
HADRONS
HELICITY
HYPERONS
INTERACTIONS
KAON MINUS-PROTON INTERACTIONS
KAON-NUCLEON INTERACTIONS
KAON-PROTON INTERACTIONS
LAMBDA PARTICLES
MATHEMATICAL MODELS
MESON RESONANCES
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
OMEGA PARTICLES
ORIENTATION
PARITY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHI-1019 RESONANCES
PIONS
PSEUDOSCALAR MESONS
QUARK MODEL
RESONANCE PARTICLES
RHO-1600 RESONANCES
SIGMA NEUTRAL
SIGMA PARTICLES
SPIN ORIENTATION
STRANGE PARTICLES
TENSOR MESONS
VECTOR MESONS