Resonance Production and Decay in Proton and Pion Induced Collisions with HADES - INSPIRE

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Resonance Production and Decay in Proton and Pion Induced Collisions with HADES

HADES

Collaboration

•

Witold Przygoda
(
- Jagiellonian U.
)

for the collaboration.

2016

11 pages

Part of Proceedings, 10th International Workshop on the Physics of Excited Nucleons (NSTAR 2015) : Osaka, Japan, May 25-28, 2015

Published in:

JPS Conf.Proc. 10 (2016) 010013

Contribution to:

- NSTAR 2015

Published: 2016

DOI:

10.7566/JPSCP.10.010013

Experiments:

GSI-HADES

reference search6 citations

Citations per year

Abstract: (Physical Society of Japan)

Resonance production and decay in proton–proton collisions at kinetic beam energies of 1.25 and 3.5 GeV as well as π^− − p reactions at four different pion beam momenta (0.656, 0.69, 0.748, and 0.8 GeV/c) are investigated. Exclusive channels with one pion in the final state (npπ^+ and ppπ^0) in the pp collisions were put to extended studies based on various observables in the framework of a one-pion exchange model and with solutions obtained within the framework of a partial wave analysis (PWA) of the Bonn-Gatchina group. In the case of the 3.5 GeV data, the study of the ppe^+e^− channel gave insight on the dielectron production from N^* and Δ in the second and third resonance regions. We show that the measured dielectron invariant mass distribution cannot be explained by a point-like resonance-γ^* coupling. Comparison with various transport models unravels the ambiguities of the descriptions and the important role of the intermediate ρ production. To tackle this problem a systematic investigation focused on the role of N(1520) production and decay in pion induced reactions on polyethylene and carbon targets. First results on exclusive channels with one pion (π^−p), two pions (nπ^+π^−) and dileptons (ne^+e^−) in the final state are presented.

resonance: production
p p: scattering
pi: beam
N(1520): production
N(1520): decay
exchange: one-pion
model: exchange
carbon: target
beam: momentum
beam: energy

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