https://doi.org/10.1140/epja/i2010-11023-0
Regular Article - Experimental Physics
Production of 
and 
hyperons in proton-proton collisions
1
Institut für Kern- und Teilchenphysik, Technische Universität Dresden, D-01062, Dresden, Germany
2
Physikalisches Institut, Universität Erlangen-Nürnberg, D-91058, Erlangen, Germany
3
Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany
4
Physikalisches Institut, Universität Tübingen, D-72076, Tübingen, Germany
5
Institut für Kern- und Hadronenphysik, Forschungszentrum Dresden-Rossendorf, D-01314, Dresden, Germany
6
Soltan Institute for Nuclear Studies, 05-400, Swierk/Otwock, Poland
7
INFN Torino, 10125, Torino, Italy
8
Helmholtz Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelm-Universität Bonn, D-53115, Bonn, Germany
9
Institut für Experimentalphysik, Ruhr-Universität Bochum, D-44780, Bochum, Germany
* e-mail: m.schulte-wissermann@physik.tu-dresden.de
Received:
9
April
2010
Accepted:
3
August
2010
Published online:
11
September
2010
This paper reports results on simultaneous measurements of the reaction channels pp
pK
+
and pp
pK
+
at excess energies of 204, 239, and 284MeV ( and 127, 162, and 207MeV ( . Total and differential cross-sections are given for both reactions. It is concluded from the measured total cross-sections that the high-energy limit of the cross-section ratio is almost reached at an excess energy of only about 200MeV. From the differential distributions observed in the overall CMS as well as in the Jackson and helicity frames, a significant contribution of interfering nucleon resonances to the production mechanism is concluded while resonant production seems to be of lesser importance and takes place only through specific partial waves of the entrance channel. The data also indicate that kaon exchange plays a minor role in the case of but an important role for production. Thus the peculiar energy dependence of the / cross-section ratio appears in a new light as its explanation requires more than mere differences between the p
and the p
final-state interaction. The data provide a benchmark for theoretical models already available or yet to come.
© SIF, Springer-Verlag Berlin Heidelberg, 2010
