Refine
Year of publication
Document Type
- Preprint (518)
- Article (281)
- Conference Proceeding (2)
Language
- English (801)
Has Fulltext
- yes (801)
Is part of the Bibliography
- no (801)
Keywords
Institute
- Physik (801)
- Frankfurt Institute for Advanced Studies (FIAS) (730)
- Informatik (693)
- Informatik und Mathematik (3)
- Hochschulrechenzentrum (1)
We present measurements of exclusive ensuremathπ+,0 and η production in pp reactions at 1.25GeV and 2.2GeV beam kinetic energy in hadron and dielectron channels. In the case of π+ and π0 , high-statistics invariant-mass and angular distributions are obtained within the HADES acceptance as well as acceptance-corrected distributions, which are compared to a resonance model. The sensitivity of the data to the yield and production angular distribution of Δ (1232) and higher-lying baryon resonances is shown, and an improved parameterization is proposed. The extracted cross-sections are of special interest in the case of pp → pp η , since controversial data exist at 2.0GeV; we find \ensuremathσ=0.142±0.022 mb. Using the dielectron channels, the π0 and η Dalitz decay signals are reconstructed with yields fully consistent with the hadronic channels. The electron invariant masses and acceptance-corrected helicity angle distributions are found in good agreement with model predictions.