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Cross section of the ppto K^+Sigma^+n reaction close to threshold

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arxiv 1007.1542 v2 pith:QBRLFZSY submitted 2010-07-09 hep-ex hep-phnucl-exnucl-th

Cross section of the ppto K^+Sigma^+n reaction close to threshold

classification hep-ex hep-phnucl-exnucl-th
keywords sigmaclosecrossdatapreviousproductionsectionspectra
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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