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

Agakishiev, G.; Alvarez-Pol, H.; Balanda, A.; Bassini, R.; Böhmer, M.; Boyard, J. L.; Cabanelas, P.; Chernenko, S.; Christ, T.; Destefanis, M.; Dohrmann, F.; Dybczak, A.; Eberl, T.; Fabbietti, L.; Fateev, O.; Finocchiaro, P.; Friese, J.; Fröhlich, I.; Galatyuk, T.; Garzon, J. A.; Gernhäuser, R.; Gilardi, C.; Golubeva, M.; Gonzalez-Diaz, D.; Guber, F.; Gumberidze, M.; Hennino, T.; Holzmann, R.; 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.; Moriniere, E.; Mousa, J.; Müntz, C.; Naumann, L.; Otwinowski, J.; Pachmayer, Y. C.; Pechenov, V.; Pechenova, O.; Pietraszko, J.; Przygoda, W.; Ramstein, B.; Reshetin, A.; Roy-Stephan, M.; Rustamov, A.; Sadovsky, A.; Sailer, B.; Salabura, P.; Sanchez, M.; Schmah, A.; Schwab, E.; Sobolev, Yu. G.; Spataro, S.; Spruck, B.; Ströbele, H.; Stroth, J.; Sturm, C.; Tarantola, A.; Teilab, K.; Tlusty, P.; Toia, A.; Traxler, M.; Trebacz, R.; Tsertos, H.; Wagner, V.; Wisniowski, M.; Wüstenfeld, J.; Yurevich, S.; Zanevsky, Y.

doi:10.1140/epja/i2012-12074-9

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

Agakishiev, G.; Alvarez-Pol, H.; Balanda, A.; Bassini, R.; Böhmer, M.; Boyard, J. L.; Cabanelas, P.; Chernenko, S.; Christ, T.; Destefanis, M.; Dohrmann, F.; Dybczak, A.; Eberl, T.; Fabbietti, L.; Fateev, O.; Finocchiaro, P.; Friese, J.; Fröhlich, I.; Galatyuk, T.; Garzon, J. A.; Gernhäuser, R.; Gilardi, C.; Golubeva, M.; Gonzalez-Diaz, D.; Guber, F.; Gumberidze, M.; Hennino, T.; Holzmann, R.; 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.; Moriniere, E.; Mousa, J.; Müntz, C.; Naumann, L.; Otwinowski, J.; Pachmayer, Y. C.; Pechenov, V.; Pechenova, O.; Pietraszko, J.; Przygoda, W.; Ramstein, B.; Reshetin, A.; Roy-Stephan, M.; Rustamov, A.; Sadovsky, A.; Sailer, B.; Salabura, P.; Sanchez, 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.; Tsertos, H.; Wagner, V.; Wisniowski, M.; Wüstenfeld, J.; Yurevich, S.; Zanevsky, Y.

We present exclusive measurements of π⁺, π⁰ and ω production in pp reactions at 1.25 GeV and 2.2 GeV beam kinetic energy, in hadronic and dielectron channels. Using the former, high statistics invariant mass and angular distributions within the HADES acceptance are obtained for π⁺ and π⁰ exclusive production, as well as acceptance corrected distributions, which are compared to a resonance model. The sensitivity of the data to the Δ(1232) production angular distribution and to the contribution of higher lying baryon resonances is shown and an improved parameterization of the data is proposed. Cross sections are extracted especially in the case of pp->ppη at 2.2 GeV (σ=0.142 ± 0.022 mb) for which only old and controversial data existed. Using the dielectron channels, the π⁰ and η Dalitz decay signals could be 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.

European Physical Journal A 48(2012), 74
DOI: 10.1140/epja/i2012-12074-9
Cited 22 times in Scopus
Contribution to WWW
arXiv:1203.1333: http://arxiv.org/pdf/1203.1333.pdf

Permalink: https://www.hzdr.de/publications/Publ-16376