Associate K0^0 production in p+p collisions at 3.5 GeV: The role of Δ(1232)++\Delta(1232)^{++}

Collaboration
Mar 26, 2014
11 pages
Published in:
  • Phys.Rev.C 90 (2014) 015202
  • Published: Jul 9, 2014
e-Print:
Experiments:

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Abstract: (APS)

An exclusive analysis of the four-body final states Λ+p+π++K0 and Σ0+p+π++K0 measured with HADES for p+p collisions at a beam kinetic energy of 3.5 GeV is presented. The analysis uses various phase space variables, such as missing mass and invariant mass distributions, in the four-particle event selection (p,π+,π+,π) to find cross sections of the different production channels, contributions of the intermediate resonances Δ++ and Σ(1385)+, and corresponding angular distributions. A dominant resonant production is seen, where the reaction Λ+Δ+++K0 has a cross section about ten times higher (29.45±0.081.46+1.67±2.06μb) than the analogous nonresonant reaction (2.57±0.021.98+0.21±0.18μb). A similar result is obtained in the corresponding Σ0 channels with 9.26±0.050.31+1.41±0.65μb in the resonant and 1.35±0.021.35+0.10±0.09μb in the nonresonant reactions.

Note:
  • 12 pages, 11 figures
  • 13.75.Cs
  • 25.40.Ep
  • 25.40.Ny
  • resonance: production
  • channel cross section: measured
  • angular distribution
  • Delta(1232)++: intermediate state
  • mass spectrum
  • missing-mass
  • Sigma(1385)+: intermediate state