Recent dibaryon studies at ANKE

Abstract

The recent results of dibaryon studies at ANKE are being presented, along with our plans concerning further studies on the topic. The D03 resonance has been observed at ANKE in the coherent pd → pd+(ππ)0 channel, accompanied by the ABC effect. An explanation of the ABC effect has been proposed, suggesting to to explain it as a kinematic cumulation of the pion pairs in the D03 → D12 + π → d + (π + π)I=0 cascade decay channel due to the predominantly collinear D12 decay. Based on this hypothesis, a search for a D21 signal in the pp → {pp}sππ reaction is suggested. The p-wave dibaryon resonances 3P2 and 3P0 have been observed at ANKE; for 3P0 it is a first experimental observation. Preliminary results for a resonance peak in the pp → {pp}sπ0 reaction with the mass m = 2646 ± 5 MeV and the width Γ = 132 ± 14 MeV are being presented. Also we propose to search for the narrow NN*(1535) resonance in the pd → pdη reaction.