Role of the $Δ$ isobar in the reaction $NN \to NNπ$ near threshold

Details Role of the $Δ$ isobar in the reaction $NN \to NNπ$ near threshold Role of the $Δ$ isobar in the reaction $NN \to NNπ$ near threshold

1998-08-10

arxiv.org/abs/nucl-th/9808020v1

Phys.Lett. B444 (1998) 25-31

Physics

Nuclear Physics

Nuclear Theory

8 pages, 5 figures, submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(98)01385-9

A model calculation for pion production in nucleon-nucleon collisions is presented. Direct production, pion rescattering and contributions from pair diagrams are taken into account. The amplitudes for the elementary processes are based on well established microscopic models of nucleon-nucleon and pion-nucleon scattering. The $\Delta (1232)$ is included explicitly and is found to play an important role even at energies close to production threshold. A good overall agreement with existing data from the pion production threshold up to the Delta resonance region is achieved.

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