Differential cross sections and recoil polarizations for the reaction {gamma}p{yields}K{sup +{Sigma}0}
Journal Article
·
· Physical Review. C, Nuclear Physics
- Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
- Old Dominion University, Norfolk, Virginia 23529 (United States)
- INFN, Laboratori Nazionali di Frascati, 00044 Frascati (Italy)
High-statistics measurements of differential cross sections and recoil polarizations for the reaction {gamma}p{yields}K{sup +{Sigma}0} have been obtained using the CLAS detector at Jefferson Lab. We cover center-of-mass energies ({radical}(s)) from 1.69 to 2.84 GeV, with an extensive coverage in the K{sup +} production angle. Independent measurements were made using the K{sup +}p{pi}{sup -}({gamma}) and K{sup +}p({pi}{sup -},{gamma}) final-state topologies, and were found to exhibit good agreement. Our differential cross sections show good agreement with earlier CLAS, SAPHIR, and LEPS results, while offering better statistical precision and a 300-MeV increase in {radical}(s) coverage. Above {radical}(s){approx_equal}2.5 GeV, t- and u-channel Regge scaling behavior can be seen at forward and backward angles, respectively. Our recoil polarization (P{sub {Sigma}}) measurements represent a substantial increase in kinematic coverage and enhanced precision over previous world data. At forward angles, we find that P{sub {Sigma}}is of the same order of magnitude but opposite sign as P{sub {Lambda},} in agreement with the static SU(6) quark model prediction of P{sub {Sigma}{approx_equal}-}P{sub {Lambda}.} This expectation is violated in some mid- and backward-angle kinematic regimes, where P{sub {Sigma}}and P{sub {Lambda}}are of similar magnitudes but also have the same signs. In conjunction with several other meson photoproduction results recently published by CLAS, the present data will help constrain the partial-wave analyses being performed to search for missing baryon resonances.
- OSTI ID:
- 21419458
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 82; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
BARYONS
BASIC INTERACTIONS
BOSONS
CEBAF ACCELERATOR
CENTER-OF-MASS SYSTEM
COMPOSITE MODELS
CROSS SECTIONS
CYCLIC ACCELERATORS
DIFFERENTIAL CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FORECASTING
GAMMA RADIATION
GEV RANGE
GEV RANGE 01-10
HADRONS
HYPERONS
INTERACTIONS
IONIZING RADIATIONS
KAONS
KAONS PLUS
LEP STORAGE RINGS
LINEAR ACCELERATORS
MATHEMATICAL MODELS
MESONS
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTON-PROTON INTERACTIONS
PHOTOPRODUCTION
PIONS
PIONS MINUS
POLARIZATION
PSEUDOSCALAR MESONS
QUARK MODEL
RADIATIONS
RECOILS
RESONANCE PARTICLES
SIGMA BARYONS
SIGMA NEUTRAL PARTICLES
SIGMA PARTICLES
STORAGE RINGS
STRANGE MESONS
STRANGE PARTICLES
SYNCHROTRONS
T CHANNEL
U CHANNEL
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
BARYONS
BASIC INTERACTIONS
BOSONS
CEBAF ACCELERATOR
CENTER-OF-MASS SYSTEM
COMPOSITE MODELS
CROSS SECTIONS
CYCLIC ACCELERATORS
DIFFERENTIAL CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FORECASTING
GAMMA RADIATION
GEV RANGE
GEV RANGE 01-10
HADRONS
HYPERONS
INTERACTIONS
IONIZING RADIATIONS
KAONS
KAONS PLUS
LEP STORAGE RINGS
LINEAR ACCELERATORS
MATHEMATICAL MODELS
MESONS
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTON-PROTON INTERACTIONS
PHOTOPRODUCTION
PIONS
PIONS MINUS
POLARIZATION
PSEUDOSCALAR MESONS
QUARK MODEL
RADIATIONS
RECOILS
RESONANCE PARTICLES
SIGMA BARYONS
SIGMA NEUTRAL PARTICLES
SIGMA PARTICLES
STORAGE RINGS
STRANGE MESONS
STRANGE PARTICLES
SYNCHROTRONS
T CHANNEL
U CHANNEL