Double pion production in $NN$ and $\bar{N}N$ collisions

Abstract

With an effective Lagrangian approach, we give a full analysis on the $NN\to NN\pi \pi$ and $\bar{N}N\to \bar{N}N\pi \pi$ reactions by exploring the roles of various resonances with mass up to 1.72 GeV. We find large contributions from $\Delta$, $N^{\ast }(1440)$, $\Delta (1600)$ and $\Delta (1620)$ resonances. Our calculations also indicate sizeable contributions from nucleon poles for the energies close to the threshold. A good description to the existing data of different isospin channels of $NN\to NN\pi \pi$ and $\bar{N}N\to \bar{N}N\pi \pi$ for beam energies up to 2.2 GeV is reached. Our results provide important implications to the ABC effect and guildlines to the future experimental projects at COSY, HADES and HIRFL-CSR. We point out that the PANDA at FAIR could be an essential place for studying the properties of baryon resonances and the data with baryon and anti-baryon in final states are worth analyzing.

arXiv commentInvited plenary talk at the 11th International Workshop on Meson Production, Properties and Interaction (MESON2010), 10-15 June, 2010, Krakow, Poland

References in corpus (5)

• Theoretical study of the N N --> N N pi pi reaction
• Phenomenological analysis of the double pion production in nucleon-nucleon collisions up to 2.2 GeV
• Covariant L-S Scheme for the effective N*NM couplings
• The role of the Roper resonance in n p --> d (pi pi)
• Search for narrow pbar p resonances in the reaction pbar p>pbar p pi+pi-

Cited by in corpus (5)

• Coupled-channel analysis of $K\Sigma$ production on the nucleon up to 2.0 GeV
• Identify the hidden charm pentaquark signal from non-resonant background in electron-proton scattering
• Phenomenological study on the $\bar{p}N\to \bar{N}N\pi \pi$ reactions
• The nucleon resonances in the $J/\psi \to p\bar{p}{\eta }^{\prime }$ decay
• Disentangle the nature of resonances in coupled-channel models