Observation of resonance-like behavior of the pp → {pp}sπ0 reaction around √s = 2.65 GeV

Vladimir Kurbatov, D. Tsirkov, V. Komarov, Bota Baimurzinova, A. Kunsafina, Zhanibek Kurmanaliev

2019

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DOI 10.1051/epjconf/201920408008

Data confidence 70 medium

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Abstract

The pp → {pp}sπ0 reaction, where {pp}s denotes a diproton, i.e. an unbound interacting proton pair in the 1S0 state, has been studied in order to obtain the forward differential cross section dσ/dΩ at 11 energy values in the region of 0.8–2.8 GeV. A resonance-like peak with the energy E0 = 2.647 ± 0.005 GeV and the width Γ = 0.26 ± 0.03 GeV has been observed in the energy dependence of the differential cross section dσ/dΩ at zero angle. The slope of the angular dependence for the energies in the peak region is different compared with the energies around it. Possible implications on this phenomenon are discussed.