Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Hadronenstruktur und -spektroskopie

HK 14.3: Talk

Monday, March 4, 2013, 17:30–17:45, WIL-C307

Measurement of the spin correlation coefficients A_x,x and A_y,y in the pn→ {pp}_s π⁻ reaction near the threshold at ANKE-COSY — •Vera Shmakova — DLNP, JINR, Joliot-Curie 6, 141980 Dubna, Moscow region, Russia — Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany

A double polarization measurement of the spin correlation coefficients A_x,x and A_y,y of the pn→ {pp}_s π⁻ process near the threshold has been performed at the ANKE-COSY spectrometer (Jülich). These results will facilitate further development of χ PT in the NN→ NNπ sector.

The transversely vector polarized deuteron beam and the hydrogen internal polarized ANKE target were used in the experiment. The pd→ dπ⁰ process data were recorded concurrently and used for beam and target polarimetry. To increase the target thickness, the polarized target was equipped with a storage cell, and the beam interaction with the cell was the main source of background events. Dedicated expositions with no gas in the cell and with the cell filled with N₂ gas, were taken to study the backgrounds. The results of the experiment and the data analysis procedure and will be presented. The future experimental program aiming to study the pN→ {pp}_s π reaction with the use of longitudinally polarized beams will be discussed.

Supported by the COSY-FFE program.