Recent dibaryon studies at ANKE

¹ Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
² Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
³ Al-Farabi Kazakh National University, KZ-050040 Almaty, Kazakhstan
⁴ Institute of Nuclear Physics, KZ-050032 Almaty, Kazakhstan
⁵ Dubna State University, RU-141980 Dubna, Russia
⁶ Department of Physics, Moscow State University, RU-119991 Moscow, Russia

^* e-mail: cyrkov@jinr.ru

Published online: 1 February 2019

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.