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arXiv · 1007.1542

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

A. Budzanowski·A. Chatterjee·H. Clement·E. Dorochkevitch·P. Hawranek·F. Hinterberger·R. Jahn·R. Joosten·K. Kilian·S. Kliczewski·Da. Kirillov·Di. Kirillov·D. Kolev·M. Kravcikova·M. Lesiak·A. Magiera·H. Machner·G. Martinska·N. Piskunov·D. Protic·J. Ritman·P. von Rossen·A. Sibirtsev·I. Sitnik·R. Siudak·R. Tsenov·K. Ulbrich·J. Urban·G. J. Wagner
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Abstract

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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A. Budzanowski, A. Chatterjee, H. Clement, E. Dorochkevitch, P. Hawranek, F. Hinterberger, R. Jahn, R. Joosten, K. Kilian, S. Kliczewski, Da. Kirillov, Di. Kirillov, D. Kolev, M. Kravcikova, M. Lesiak, A. Magiera, H. Machner, G. Martinska, N. Piskunov, D. Protic, J. Ritman, P. von Rossen, A. Sibirtsev, I. Sitnik, R. Siudak, R. Tsenov, K. Ulbrich, J. Urban, G. J. Wagner. 2010-07-09. Cross section of the $pp\to K^+\Sigma^+n$ reaction close to threshold. https://doi.org/10.1016/j.physletb.2010.07.015

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