Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES
Date
2012Author
Agakishiev, G.Alvarez-Poll, H.
Bałanda, A.
Bassini, R.
Böhmer, M.
Bokemeyer, H.
Boyard, J. L.
Cabanelas, Pablo
Chernenko, S.
Christ, T.
Destefanis, M.
Dohrmann, F.
Dybczak, A.
Eberl, T.
Fabbietti, L.
Fateev, O.
Finocchiaro, P.
Friese, J.
Fröhlich, I.
Galatyuk, T.
Garzón, J. A.
Gernhäuser, R.
Gilardi, C.
Golubeva, M.
González-Diaz, D.
Guber, F.
Gumberidze, M.
Hennino, T.
Holzmann, R.
Ierusalimov, A.
Iori, I.
Ivashkin, A.
Jurkovic, M.
Kämpfer, B.
Kanaki, K.
Karavicheva, T.
Koenig, I.
Koenig, W.
Kolb, B. W.
Kotte, R.
Kozuch, A.
Krizek, F.
Kühn, W.
Kugler, A.
Kurepin, A.
Lang, S.
Lapidus, K.
Liu, T.
Maier, L.
Markert, J.
Metag, V.
Michalska, B.
Morinière, E.
Mousa, J.
Münch, M.
Müntz, C.
Naumann, L.
Otwinowski, J.
Pachmayer, Y. C.
Pechenov, V.
Pechenova, O.
Pérez Cavalcanti, T.
Pietraszko, J.
Pospisil, V.
Przygoda, W.
Ramstein, B.
Reshetin, A.
Roy-Stephan, M.
Rustamov, A.
Sadovsky, A.
Sailer, B.
Salabura, P.
Sánchez, M.
Schmah, A.
Schwab, E.
Sobolev, Y. G.
Spataro, S.
Spruck, B.
Ströbele, H.
Stroth, J.
Sturm, C.
Tarantola, A.
Teilab, K.
Tlusty, P.
Toia, A.
Traxler, M.
Trebacz, R.
![ORCID logo](https://orcid.org/sites/default/files/images/orcid_16x16.png)
Wagner, V.
Wisniowski, M.
Wojcik, T.
Wüstenfeld, J.
Yurevich, S.
Zanevsky, Y.
Zumbruch, P.
ISSN
1434-6001Source
European Physical Journal AVolume
48Issue
5Pages
1-17Google Scholar check
Metadata
Show full item recordAbstract
We present measurements of exclusive π+,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 → ppη, since controversial data exist at 2. 0GeV we find σ = 0. 142±0. 022mb. 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. © 2012 The Author(s).