Grzonka, D.
P P --> P LAMBDA K+
[2.607]
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Comparison of Lambda and Sigma0 threshold production in proton proton collisions.

Sewerin, S. ; Schepers, G. ; Balewski, J.T. ; et al.
Phys.Rev.Lett. 83 (1999) 682-685, 1999.
Inspire Record 478929 DOI 10.17182/hepdata.42059

Threshold measurements of the associated strangeness production reactions pp --> p K(+) Lambda and pp --> p K(+) Sigma(0) are presented. Although slight differences in the shapes of the excitation functions are observed, the most remarkable feature of the data is that at the same excess energy the total cross section for the Sigma(0) production appears to be about a factor of 28 smaller than the one for the Lambda particle. It is concluded that strong Sigma(0)-p final state interactions, and in particular the Sigma-N --> Lambda-p conversion reaction, are the likely cause of the depletion for the yield in the Sigma signal. This hypothesis is in line with other experimental evidence in the literature.

1 data table
Table 1

The given errors are statistical only. The cross section presented as a function of the nominal excess energy.


Strangeness production in the reaction pp --> K+ Lambda p in the threshold region

Bilger, R ; Böhm, A ; Brand, H ; et al.
Phys.Lett.B 420 (1998) 217-224, 1998.
Inspire Record 487234 DOI 10.17182/hepdata.28210

The reaction pp → K + Λp was measured exclusively at the cooler synchrotron COSY at beam momenta of p Beam = 2.50 GeV/c and p Beam = 2.75 GeV/c using the TOF detector. Angular and momentum distributions were obtained for the full phase space of the reaction products. Total cross sections were extracted to be (2.7 ± 0.3) μ b and (12.0 ± 0.4) μ b, respectively. The polarization of the Λ -hyperon was determined as a function of its transversal momentum and was found to be negative for transverse momentum transfers of p T ≥ 0.3 GeV/c. The results together with existing data are compared with phenomenological parametrizations and model calculations on the basis of meson exchange.

1 data table
Table 1

Axis error includes +- 10/10 contribution (Overall normalization error).


First results from COSY

Grzonka, D. ; Kilian, K. ;
Nucl.Phys.A 626 (1997) 41C-54C, 1997.
Inspire Record 463146 DOI 10.17182/hepdata.36466

None

1 data table
Table 1

Preliminary data.