Abstract
Pion beams are important tools to study features of baryonic resonances and their decay channels because resonances are produced in s-channel at fixed mass equal to √s. In 2014 the HADES collaboration has performed systematic measurements in the second resonance region scanning around the mass of the N*(1520). Pion beams at four momenta (0.654, 0.686, 0.738 and 0.787 GeV/c) impinging on polyethylene and carbon targets have been used. With the use of the multichannel Partial Wave Analysis (PWA) the role of the N*(1520) resonance in conjunction with the intermediate ρ-meson production has been studied. Preliminary results at 0.654 GeV/c on exclusive production of two pions (ηπ+π- and pπ-π0) in the final state are presented.
Highlights
MotivationHigh Acceptance Di-Electron Spectrometer (HADES) has proposed an experimental program [1, 2] focused on combined measurements of hadron and dielectron production in pion induced reactions [3,4,5,6,7]
Investigations of the dielectron channel like π− p → ne+e−, which has been measured in the same experiment allows one to understand the role of the ρ meson in electromagnetic transitions in the time-like region [3,4,5, 8]
The partial wave analysis of the High Acceptance Di-Electron Spectrometer (HADES) data was performed in cooperation with the Bonn-Gatchina group [13]
Summary
HADES has proposed an experimental program [1, 2] focused on combined measurements of hadron and dielectron production in pion induced reactions [3,4,5,6,7]. The combined analysis of hadronic and electromagnetic channels is crucial for validation of the Vector Meson Dominance model and will help to understand the ρ-meson production mechanism [5]. Investigations of the dielectron channel like π− p → ne+e−, which has been measured in the same experiment allows one to understand the role of the ρ meson in electromagnetic transitions in the time-like region [3,4,5, 8]. In particular the ρ-N coupling is investigated in context of electromagnetic transition form-factors
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