Two-Pion production in the second resonance region in ${\pi }^{-}p$ collisions with HADES

Abstract

Pion induced reactions provide unique opportunities for an unambiguous description of baryonic resonances and their coupling channels by means of a partial wave analysis. Using the secondary pion beam at SIS18, the two pion production in the second resonance region has been investigated to unravel the role of the $N(1520){\frac{3}{2}}^{-}$ resonance in the intermediate $\rho$ production. Results on exclusive channels with one pion (${\pi }^{-}p$) and two pions (${\pi }^{+}{\pi }^{-}n$, ${\pi }^0{\pi }^{-}p$) in the final state measured in the ${\pi }^{-}-p$ reaction at four different pion beam momenta (0.650, 0.685, 0.733, and 0.786 GeV/c) are presented. The excitation function of the different partial waves and $\Delta \pi$, $N\sigma$ and $N\rho$ isobar configurations is obtained, using the Bonn-Gatchina partial wave analysis. The $N(1520){\frac{3}{2}}^{-}$ resonance is found to dominate the $N\rho$ final state with the branching ratio $BR=12.2\pm 1.9\%$.

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• A covariant model for the decuplet to octet Dalitz decays
• Note on the definitions of branching ratios of overlapping resonances
• Role of baryon resonances in the ${\pi }^{-}p\to n{e}^{+}{e}^{-}$ reaction within an effective-Lagrangian model
• Meson cloud contributions to the Dalitz decays of decuplet to octet baryons
• Dilepton Decay of Low-mass $\rho$ Mesons