Phi meson and accompanying strange particle production in 16 GeV/c. pi. /sup +/p interactions. Final report
We have studied phi production in 16 GeV/c ..pi../sup +/p interactions. K/sup -/ identified in a Cherenkov counter were used to trigger the Stanford Linear Accelerator Center 2-meter streamer chamber. A sample of inclusive phi events was thus obtained where phi ..-->.. K/sup -/K/sup +/. Information from a second Cherenkov counter was used to identify the K/sup +/ off-line. In addition, the visible decays in the streamer chamber of ..lambda../sup 0/ ..-->.. p..pi../sup -/ and K/sub s//sup 0/ ..-->.. ..pi../sup +/..pi../sup -/ were used to obtain events of the type ..pi../sup +/p ..-->.. phi ..lambda../sup 0/ + anything and ..pi../sup +/p ..-->.. phi K/sub s//sup 0/ + anything. With 1.26 x 10/sup 9/ ..pi../sup +/ onto a 61 cm liquid hydrogen target, the experiment had a raw sensitivity of 3.1 events/nb. For the film measured so far, taking into account geometric acceptance, unseen decay modes, and all efficiency corrections, the sensitivities are 7.1 events/..mu..b, 22 events/..mu..b, and 27 events/..mu..b respectively for the phi inclusive, phi with ..lambda../sup 0/, and phi with K/sub x//sup 0/ samples. The acceptance covers the region in Feynman's x, x/sub phi/ > 0.5. The measured cross sections for x/sub phi > 0.5 are sigma(phi + chi) = 1.3 +- 2.0 ..mu..b, sigma(phi ..lambda../sup 0/ + chi) = 0.37 +- 0.16 ..mu..b, and sigma(phi K/sub s//sup 0/ + chi) = 0.33 +- 0.15 ..mu..b. When account is taken of unseen associated channels, it is concluded that phi is predominantly produced conjointly with pairs of strange particles. This agrees with the OZI rule, and is consistent with phi being produced by a quark fusion type process, rather than gluon fusion or light quark annihilation. 43 references.
- Research Organization:
- Michigan State Univ., East Lansing (USA). Dept. of Physics
- DOE Contract Number:
- AC02-77ER14529
- OSTI ID:
- 5652272
- Report Number(s):
- DOE/ER/14529-T1; ON: DE84002769
- Resource Relation:
- Other Information: Portions are illegible in microfiche products. Thesis
- Country of Publication:
- United States
- Language:
- English
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PHI-1019 RESONANCES
PARTICLE PRODUCTION
PION PLUS-PROTON INTERACTIONS
STRANGE PARTICLES
CHERENKOV COUNTERS
CROSS SECTIONS
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HADRONIC PARTICLE DECAY
HODOSCOPES
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KAONS NEUTRAL SHORT-LIVED
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INFORMATION
INTERACTIONS
KAONS
KAONS NEUTRAL
MEASURING INSTRUMENTS
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PION-NUCLEON INTERACTIONS
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645103* - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties