Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Hadronenstruktur und -spektroskopie

HK 19.2: Vortrag

Montag, 4. März 2013, 17:15–17:30, HSZ-105

Results for the p^→p → pK⁺Λ Reaction Measured at COSY-TOF with a Polarized Proton Beam of 2.70 GeV/c — •Florian Hauenstein — Universitaet Erlangen-Nuernberg, Erlangen, Deutschland

The COSY-TOF detector setup was recently upgraded with a new tracking system including a Straw Tube Tracker (STT). This upgrade increases the reconstruction efficiency and the precision of the event reconstruction significantly. Together with the polarized beam it allows to determine the spin triplet pΛ scattering length. Additionally the production mechanism of the p^→p → pK⁺Λ reaction can be studied from polarization observables and the Dalitz plot. The latter can also be used to determine contributions of N^* resonances.

In 2011 a measurement was performed with a polarized proton beam of 2.70 GeV/c momentum. In this talk preliminary results on the Dalitz plot, angular distributions and polarization observables will be presented. It will be shown that the NΣ cusp effect in the reaction is less strong than in other COSY-TOF measurements at higher beam momenta. In addition the behaviour of the kaon analyzing power and Λ polarization is compared to a previous measurement at 2.95 GeV/c. The latter changes its sign at 2.70 GeV/c compare to higher beam momenta.