High-statistics study of the reactions. pi. /sup -/p. -->. K/sup -/K/sup +/n and. pi. /sup +/n. -->. K/sup -/K/sup +/p at 6 GeV/c

Journal Article · Wed Jun 01 04:00:00 EDT 1977 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.15.3196· OSTI ID:7219614

Pawlicki, A J; Ayres, D S; Cohen, D; Diebold, R; Kramer, S L; Wicklund, A B

The Argonne Effective Mass Spectrometer has been used for a high-precision study of the reactions ..pi../sup -/p ..-->.. K/sup -/K/sup +/n (110 000 events) and ..pi../sup +/n ..-->.. K/sup -/K/sup +/p (50 000 events) at 6 GeV/c for K/sup -/K/sup +/ masses below 1750 MeV and momentum transfers -t < 0.40 GeV/sup 2/. Comparison of the two reactions isolates interferences between isospin-0 and isospin-1 K/sup -/K/sup +/ states. We observe f-A/sub 2//sup 0/, f'-A/sup 0//sub 2/, and f-f' interferences in the Y/sup 0//sub 4/ moment and find f' production to have a substantial contribution from some mechanism other than pion exchange. We present values for the f' mass (1506 +- 5 MeV), width (66 +- 10 MeV), and branching ratio ((f' ..-->.. ..pi pi../f' ..-->.. all) = (1.2 +- 0.4) %). The relative f-f' production phase is found to be 170 +- 10/sup 0/; the 2/sup + +/ nonet mixing angle is determined to be 32.5 +- 0.5/sup 0/, which is less than the ideal value. The measured relative f-A/sup 0//sub 2/ production phase of (63/sup +11/ -/sub 15/) degree confirms a prediction of Irving and Michael based on duality and vector-meson production studies. The K-barK branching ratio of the f meson is measured to be (f ..-->.. K-barK/f ..-->.. all) = (3.8 +- 0.4) %. An SU(3) prediction for the ratio of the rhoKK to the rho..pi pi.. coupling is found to agree with the data. In addition to the isospin-0 S*, substantial isospin-1 S-wave production is observed near the K/sup -/K/sup +/ threshold and the effects of the recently reported S-wave enhancement of mass approx. 1300 MeV are observed. Our results show that the enhancement has isospin 0, with a slow variation of phase.

• Research Organization: Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 7219614
• Journal Information: Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 15:11; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645104* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
A RESONANCES
A2-1310 RESONANCES
ANGULAR DISTRIBUTION
BOSONS
BRANCHING RATIO
COUPLING
CROSS SECTIONS
DECAY
DISTRIBUTION
DUALITY
ELEMENTARY PARTICLES
ENERGY RANGE
F-1260 RESONANCES
F-1514 RESONANCES
GEV RANGE
GEV RANGE 01-10
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
INTERFERENCE
ISOSPIN
KAONS
KAONS MINUS
KAONS PLUS
LINEAR MOMENTUM
MASS
MATHEMATICAL MODELS
MESON RESONANCES
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
PARITY
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PARTICLE WIDTHS
PION MINUS-PROTON INTERACTIONS
PION PLUS-NEUTRON INTERACTIONS
PION-NEUTRON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PIONS
PSEUDOSCALAR MESONS
QUANTUM NUMBERS
RESONANCE PARTICLES
RHO-765 RESONANCES
S WAVES
STATISTICAL MODELS
STRANGE PARTICLES
TENSOR MESONS
VECTOR MESONS