Cross section of the $pp\to K^{+}{\Sigma }^{+}n$ reaction close to threshold

Abstract

We have measured inclusive data on $K^{+}$-meson production in $pp$ collisions at COSY Jülich close to the hyperon production threshold and determined the hyperon-nucleon invariant mass spectra. The spectra were decomposed into three parts: $\Lambda p$, ${\Sigma }^{0}p$ and ${\Sigma }^{+}n$. The cross section for the ${\Sigma }^{+}n$ channel was found to be much smaller than a previous measurement in that excess energy region. The data together with previous results at higher energies are compatible with a phase space dependence.

accepted by Phys. lett. B some typos corrected

References in corpus (5)

• Threshold hyperon production in proton-proton collisions at COSY-11
• High resolution study of the Lambda p final state interaction in the reaction p + p -> K+ + (Lambda p)
• The pp->K+ n Sigma+ reaction near threshold
• Phenomenology of the Lambda/Sigma^0 production ratio in pp collisions
• The pp -> K^+Sigma^+n cross section from missing mass spectra

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• Upper limits for a narrow resonance in the reaction p + p -> K^+ + (Lambda p)
• Reexamination of the role of the ${\Delta }^{\ast }$ resonances in the $pp\to n{K}^{+}{\Sigma }^{+}$ reaction
• The legacy of the experimental hadron physics programme at COSY
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• Combined Partial Wave Analysis for the description of exclusive $p+p\to p+K^{+}+\Lambda$ production
• Strangeness Production in Hadron Reactions