Contribution of the Δ-isobar excitation mechanism to the pp → {pp} s π0 reaction

Yu. N. Uzikov, Onlasun Imambekov

2017

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DOI 10.1134/s1063779617060582
Data confidence 70 medium
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Abstract

The differential cross section of the reaction pp → {pp} s π0, where {pp} s is the proton pair in the 1S0 state at a small excitation energy E pp < 3 MeV, is calculated using the box diagram with the excitation of the Δ-isobar. The model demonstrates a clear bump observed in the experimental data at the beam energy of ∼0.6 GeV and the zero diproton outgoing angle; however, its absolute value strongly depends on the off-shell extrapolation of the πNΔ vertex factor and underestimates the data.