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Associate K^0 production in p+p collisions at 3.5 GeV: The role of Delta(1232)++

Abstract : An exclusive analysis of the 4-body final states $\mathrm{\Lambda + p + \pi^{+} + K^{0}}$ and $\mathrm{\Sigma^{0} + p + \pi^{+} + K^{0}}$ 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, $\pi^+$, $\pi^+$, $\pi^-$) to find cross sections of the different production channels, contributions of the intermediate resonances $\mathrm{\Delta^{++}}$ and $\mathrm{\Sigma(1385)^{+}}$ and corresponding angular distributions. A dominant resonant production is seen, where the reaction $\mathrm{\Lambda + \Delta^{++} + K^{0}}$ has an about ten times higher cross section ($\mathrm{29.45\pm0.08^{+1.67}_{-1.46}\pm2.06\,\mu b}$) than the analogous non-resonant reaction ($\mathrm{2.57\pm0.02^{+0.21}_{-1.98}\pm0.18\,\mu b}$). A similar result is obtained in the corresponding $\Sigma^{0}$ channels with $\mathrm{9.26\pm0.05^{+1.41}_{-0.31}\pm0.65\,\ mu b}$ in the resonant and $\mathrm{1.35\pm0.02^{+0.10}_{-1.35}\pm0.09\,\mu b}$ in the non-resonant reactions.
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Contributor : Sophie Heurteau <>
Submitted on : Monday, April 14, 2014 - 10:41:09 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:31 PM

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G. Agakishiev, O. Arnold, D. Belver, A. Belyaev, J. C. Berger-Chen, et al.. Associate K^0 production in p+p collisions at 3.5 GeV: The role of Delta(1232)++. Physical Review C, American Physical Society, 2014, 90 (1), pp.015202. ⟨10.1103/PhysRevC.90.015202⟩. ⟨in2p3-00978410⟩



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