Study of the ABC effect in the pd → pdππ reaction with d* (2380) resonance excitation.
Presented by Г-н. Zhanibek KURMANALIYEV
Track: Experimental Nuclear Physics
Recently, after the discovery of the resonance d*(2380) (D03), considered as a candidate for true dibaryons, the ABC-effect was found to be associated with its excitation. The ABC effect-the peak in the mass spectrum of pion pairs near the birth threshold-has no generally accepted theoretical explanation, so this connection attracted a special interest of the scientific community. The reaction p + d → p + d + X was studied in proton beam energies of 0.8-2.0 GeV on ANKE/COSY magnetic spectrometer. Proton-deuteron pairs with high momenta 0.6-1.8 GeV/c were recorded at small angles relative to the proton beam. The distribution of the missing mass of the born pion pairs reveals a local excess near the threshold, characteristic of the ABC effect. The report presents the results of studying the ABC effect and excitation of the D03 resonance in the pd→pdππ reaction by means of meson exchange in coherent kinematics.