This title appears in the Scientific Report :
2016
Please use the identifier:
http://dx.doi.org/10.1140/epja/i2016-16337-1 in citations.
Please use the identifier: http://hdl.handle.net/2128/22785 in citations.
Measurement of polarization observables of the associated strangeness production in proton proton interactions
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 significantly...
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Personal Name(s): | Hauenstein, F. |
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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. (Corresponding author) / Röder, M. / Schroeder, W. / Sefzick, T. / Smyrski, J. / Wintz, P. / Wüstner, P. | |
Contributing Institute: |
JARA-FAME; JARA-FAME Experimentelle Hadronstruktur; IKP-1 |
Published in: | The @European physical journal / A, 52 (2016) 11, S. 337 |
Imprint: |
Berlin
Springer
2016
|
DOI: |
10.1140/epja/i2016-16337-1 |
Document Type: |
Journal Article |
Research Program: |
Cosmic Matter in the Laboratory |
Link: |
Restricted Restricted OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/22785 in citations.
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. |