Low-energy pion-pion scattering in the $pp\to pp{\pi }^{+}{\pi }^{-}$ and $p\bar{p}\to p\bar{p}{\pi }^{+}{\pi }^{-}$ reactions

Abstract

We evaluate the contribution of pion-pion rescattering to the $pp\to pp{\pi }^{+}{\pi }^{-}$ and $p\bar{p}\to p\bar{p}{\pi }^{+}{\pi }^{-}$ reactions. We compare our results with the close-to-threshold experimental data. The pion-pion rescattering contribution is found there to be negligible. The predictions for future experiments with PANDA detector at High Energy Storage Ring (HESR) in GSI Darmstadt are presented. It is discussed how to cut off the dominant Roper resonance and double-$\Delta$ excitation mechanisms leading to the $pp{\pi }^{+}{\pi }^{-}$ channel in final state. Differential distributions in momentum transfers, transverse momentum, effective two-pions mass, relative azimuthal angle between pions, and pion rapidities are presented.

14 pages, 11 figures

References in corpus (4)

• The pion-pion scattering amplitude. III: Improving the analysis with forward dispersion relations and Roy equations
• Two-Pion Production in Proton-Proton Collisions with Polarized Beam
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Cited by in corpus (3)

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• Measurement of exclusive production of scalar ${\chi }_{c0}$ meson in proton-(anti)proton collisions via ${\chi }_{c0}\to {\pi }^{+}{\pi }^{-}$ decay
• $pp\to pp{\eta }^{\prime }$ reaction at high energies