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Measurement of polarization observables of the associated strangeness production in proton proton interactions

. The Λ polarization, the analyzing power, and the Λ spin transfer coefficient of the reaction pp → pK + Λ were measured at beam momenta of 2.70GeV/c and 2.95GeV/c corresponding to excess energies of 122MeV and 204MeV. While the analyzing power and the spin transfer coefficient do not change signifi...

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Published in:The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2016-11, Vol.52 (11), p.1-23, Article 337
Main Authors: Hauenstein, F., Borodina, E., Clement, H., Doroshkevich, E., Dzhygadlo, R., Ehrhardt, K., Eyrich, W., Gast, W., Gillitzer, A., Grzonka, D., Jowzaee, S., Klaja, P., Kober, L., Kilian, K., Krapp, M., Mertens, M., Moskal, P., Ritman, J., Roderburg, E., Röder, M., Schroeder, W., Sefzick, T., Smyrski, J., Wintz, P., Wüstner, P.
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Language:English
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Summary:. The Λ polarization, the analyzing power, and the Λ spin transfer coefficient of the reaction pp → pK + Λ were measured at beam momenta of 2.70GeV/c and 2.95GeV/c corresponding to excess energies of 122MeV and 204MeV. While the analyzing power and the spin transfer coefficient do not change significantly with the excess energy, the Λ polarization varies strongly and changes its sign. As this is the first measurement of polarization observables below an excess energy of 200MeV, the change of the sign of the Λ polarization was not observed before. The high statistics of the data ( ≈ 200 k events for each momentum) enables detailed studies of the dependence of the Λ polarization and the analyzing power on the center-of-mass momentum of the particles. The results of the spin transfer coefficient are in qualitative agreement with the DISTO experiment. The Λ polarization data of 2.95GeV/c are only conform with the DISTO experiment, while both the 2.70GeV/c and 2.95GeV/c data differ strongly from all previous measurements, whether exclusive or inclusive.
ISSN:1434-6001
1434-601X
DOI:10.1140/epja/i2016-16337-1