2020/04/17 by J. Adamczewski-Musch, O. Arnold, E. T. Atomssa +126
Physics and Astronomy · #Baryon #High-Energy Particle Collisions Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Production (economics) #Quantum Chromodynamics and Particle Interactions #Resonance (particle physics) #nucl-ex
paper · pdf · doi:10.1103/physrevc.102.024001
published as Phys. Rev. C 102, 024001 (2020)
arxiv created 2020/04/17 · openalex created_date 2020/04/24 · openalex publication_date 2020/08/07 · arxiv updated 2020/08/12 · openalex updated_date 2026/08/05
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)(3)/(2)^\ensuremath-resonance in the intermediate \ensuremathρ-meson production. Results on exclusive channels with one pion (\ensuremathπ^\ensuremath-p) and two pions (\ensuremathπ+\ensuremathπ^\ensuremath-n, \ensuremathπ0\ensuremathπ^\ensuremath-p) in the final state measured in the \ensuremathπ^\ensuremath-\text\ensuremath-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 \mathrm\ensuremathΔ\ensuremathπ, N\ensuremathσ, and N\ensuremathρ isobar configurations is obtained, using the Bonn-Gatchina partial-wave analysis. The N(1520)(3)/(2)^\ensuremath- resonance is found to dominate the N\ensuremathρ final state with the branching ratio BR=12.2%\ifmmode±\else\textpm\fi1.9%.