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

The COSY-HIRES collaboration Budzanowski, A. ; Chatterjee, A. ; Clement, H. ; et al.

Phys.Lett.B 692 (2010) 10-14, 2010.

Inspire Record 861052 DOI 10.17182/hepdata.55371

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.

3 data tables

Table 1

Total cross section for P P --> K+ SIGMA+ N. Errors are combined statistics and systematics.

Table 2

Deduced total cross section for P P --> K+ P LAMBDA.

Table 3

Deduced total cross section for P P --> K+ SIGMA0 P.