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
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BOSONS
CHERENKOV COUNTERS
CROSS SECTIONS
DATA
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
GAS TRACK DETECTORS
GEV RANGE
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
HADRONIC PARTICLE DECAY
HADRONS
HODOSCOPES
HYPERONS
INFORMATION
INTERACTIONS
KAONS
KAONS MINUS
KAONS NEUTRAL
KAONS NEUTRAL SHORT-LIVED
KAONS PLUS
LAMBDA PARTICLES
MEASURING INSTRUMENTS
MESON RESONANCES
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHI-1019 RESONANCES
PION PLUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
RESONANCE PARTICLES
SPARK CHAMBERS
STRANGE PARTICLES
STREAMER SPARK CHAMBERS
VECTOR MESONS