Darmstadt 2016 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

HK: Fachverband Physik der Hadronen und Kerne

HK 63: Hadron Structure and Spectroscopy X

HK 63.3: Talk

Friday, March 18, 2016, 14:45–15:00, S1/01 A4

Polarization Observables Measured in the Reaction p^→p → pK⁺Λ by COSY-TOF — •Florian Hauenstein for the COSY-TOF collaboration — Forschungszentrum Juelich, Juelich

The p^→p → pK⁺Λ reaction was measured with the COSY-TOF detector using a polarized proton beam with beam momenta 2.7 GeV/c and 2.95 GeV/c. The measurements with a polarized beam allow the determination of polarization observables in addition to the differential cross sections. These observables are the Λ polarization, the spin transfer to the Λ and the analyzing power of the final state particles. The latter is connected with the partial wave composition of the final state system, while the first two can improve the understanding of the underlying reaction mechanism of the associated strangeness production. Currently, no sophisticated models exist in this energy regime, thus, conclusive results concerning the reaction mechanism can not be drawn yet. Nevertheless, the obtained data are the first with full phase space acceptance and high statistics in this beam energy regime.

In this talk the extraction methods for the different polarization observables will be explained, and results for the polarization observables as a function of different variables will be shown. The dependencies of the results on the beam momentum will be discussed. Furthermore, a comparison with theoretical expectations from high energy physics for the Λ polarization will be given.