Zara Bagdasarian for the ANKE Collaboration - PowerPoint PPT Presentation

Mitglied der Helmholtz-Gemeinschaft Zara Bagdasarian for the ANKE Collaboration z.bagdasarian@fz-juelich.de Forschungszentrum Jülich Universität zu Köln Ivane Javakhishvili Tbilisi State University January 26 th 2015 Bormio, Italy 53 rd International Winter Meeting on Nuclear Physics

MOTIVATION: Nucleon-Nucleon Interaction Characterize short-range nucleon-nucleon interaction by pinning down the parameters for the Phase Shift Analysis (PSA) à need to measure experimental observables d σ /d Ω (pp) EDDA A y (pp) Wealth of data (35°< θ p <90°) T p ≤ 2.5 GeV No experimental data at smaller angles ( θ p <35°) above T p =1.0 GeV ANKE 26/01/15 Zara Bagdasarian. 53rd International Winter Meeting on Nuclear Physics, Bormio. 2

EXPERIMENT: COSY (Cooler Synchrotron) ANKE Beam: transversely polarized protons Target: hydrogen or deuterium Energy range: 0.045 – 2.8 GeV 26/01/15 Zara Bagdasarian. 53rd International Winter Meeting on Nuclear Physics, Bormio. 3

RESULTS: Analyzing Power y y A STT STT A EDDA EDDA 0.5 FD FD 0.3 SAID (partial wave 0.4 analysis) recent 0.3 0.2 solution (2007) 0.2 ANKE STT 0.1 796 MeV 1965 MeV ANKE FD 0.1 EDDA SAID new solution SAID description of NN (2014) World data without new 0.3 0.3 ANKE results Agreement 0.2 0.2 with the existing data 0.1 0.1 1600 MeV 2157 MeV at 0.8 GeV SAID description of NN World data with new 0.3 0.3 ANKE results Brand New 0.2 0.2 Data at five energies for 0.1 0.1 1800 MeV 2368 MeV SAID! 0 10 20 30 40 50 60 70 80 0 10 20 30 40 50 60 70 80 θ θ cm cm 26/01/15 Zara Bagdasarian. 53rd International Winter Meeting on Nuclear Physics, Bormio. 4