Cross section of the $pp\to K^+Σ^+n$ reaction close to threshold

Details Cross section of the $pp\to K^+Σ^+n$ reaction close to threshold Cross section of the $pp\to K^+Σ^+n$ reaction close to threshold

2010-07-09

arxiv.org/abs/1007.1542v2

Physics

High Energy Physics

High Energy Physics - Experiment

accepted by Phys. lett. B some typos corrected

Scientific paper

We have measured inclusive data on $K^+$-meson production in $pp$ collisions at COSY J\"ulich close to the hyperon production threshold and determined the hyperon-nucleon invariant mass spectra. The spectra were decomposed into three parts: $\Lambda p$, $\Sigma^0p$ 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.

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