The pp{yields}p{Lambda}K{sup +} and pp{yields}p{Sigma}{sup 0}K{sup +} reactions with chiral dynamics

Journal Article · Thu Sep 15 04:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.84.034004· OSTI ID:21596728

Jujun, Xie ^[1]; Huaxing, Chen ^[1]; Oset, E ^[1]

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1. Instituto de Fisica Corpuscular (IFIC), Centro Mixto CSIC-Universidad de Valencia, Institutos de Investigacion de Paterna, Aptd. 22085, E-46071 Valencia (Spain)

We report on a theoretical study of the pp{yields}p{Lambda}K{sup +} and pp{yields}p{Sigma}{sup 0}K{sup +} reactions near threshold using a chiral dynamical approach. The production process is described by single-pion and single-kaon exchange. The final state interactions of nucleon-hyperon, K-hyperon, and K-nucleon systems are also taken into account. We show that our model leads to a fair description of the experimental data on the total cross section of the pp{yields}p{Lambda}K{sup +} and pp{yields}p{Sigma}{sup 0}K{sup +} reactions. We find that the experimental observed strong suppression of {Sigma}{sup 0} production compared to {Lambda} production at the same excess energy can be explained. However, ignorance of phases between some amplitudes does not allow one to properly account for the nucleon-hyperon final state interaction for the pp{yields}p{Sigma}{sup 0}K{sup +} reaction. We also demonstrate that the invariant mass distribution and the Dalitz plot provide direct information about the {Lambda} and {Sigma}{sup 0} production mechanisms and may be tested by experiments at COSY or HIRFL-CSR.

• OSTI ID: 21596728
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 84; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
AMPLITUDES
BARYON-BARYON INTERACTIONS
BARYONS
BOSONS
CHIRALITY
COSY STORAGE RING
CROSS SECTIONS
CYCLIC ACCELERATORS
CYCLOTRONS
DALITZ PLOT
DECAY
DIAGRAMS
DISTRIBUTION
ELEMENTARY PARTICLES
FERMIONS
FINAL-STATE INTERACTIONS
HADRON-HADRON INTERACTIONS
HADRONS
HEAVY ION ACCELERATORS
HIRFL CYCLOTRON
HYPERONS
INFORMATION
INTERACTIONS
ISOCHRONOUS CYCLOTRONS
KAONS
KAONS PLUS
LAMBDA BARYONS
LAMBDA PARTICLES
MASS DISTRIBUTION
MESONS
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PIONS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
PSEUDOSCALAR MESONS
SCATTERPLOTS
SIGMA BARYONS
SIGMA NEUTRAL PARTICLES
SIGMA PARTICLES
SIMULATION
SPATIAL DISTRIBUTION
STORAGE RINGS
STRANGE MESONS
STRANGE PARTICLES
SYNCHROTRONS
TOTAL CROSS SECTIONS