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

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 
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.
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Author:Geydar Agakishiev, Alvarez-Pol, Balanda, Bassini, Michael Böhmer, Bokemeyer, Boyard, Cabanelas, Chernenko, Christ, Destefanis, Dohrmann, Dybczak, Eberl, Laura Fabbietti, Oleg Fateev, Finocchiaro, Jürgen Friese, Ingo Fröhlich, Tetyana Galatyuk, Juan A. Garzón, Roman Gernhäuser, Camilla Gilardi, Marina Golubeva, Diego González-Dıaz, Fedor Guber, Gumberidze, Hennino, Holzmann, Holzmann, Ierusalimov, Iori, Alexander Ivashkin, Martin Jurkovic, Kämpfer, Kanaki, Tatiana Karavicheva, Ilse Koenig, Wolfgang Koenig, Burkhard W. Kolb, Kotte, Kozuch, Krizek, Wolfgang Kühn, Andrej Kugler, Alexei Kurepin, S Lang, Kirill Lapidus, T. Liu, Ludwig Maier, Jochen Markert, Volker Metag, Beata Michalska, Emilie Morinière, Jehad Mousa, Mathias Münch, Christian Münch, Naumann, Jacek Tomasz Otwinowski, Yvonne C. Pachmayer, Vladimir Pechenov, Olga Pechenova, Tiago Pérez Cavalcanti, Jerzy Pietraszko, Vladimir Pospısil, Witold Przygoda, Béatrice Ramstein, Andrey Reshetin, M. Roy-Stephan, Anar Rustamov, Alexander Sadovsky, Benjamin Sailer, Piotr Salabura, M. Sánchez, Alexander Schmah, Erwin Schwab, Yuri Sobolev, Stefano Spataro, Björn Spruck, Herbert Ströbele, Joachim Stroth, Christian Sturm, Attilio Tarantola, Khaled Teilab, Pavel Tlusty, Alberica Toia, Michael Traxler, Radoslaw Trebacz, Haralabos Tsertos, Vladimir Wagner, Marcin Wisniowski, Tomasz Wojcik, Jörn Wüstenfeld, Sergey Yurevich, Yuri Zanevsky, Peter Zumbruch
URN:urn:nbn:de:hebis:30:3-273091
DOI:http://dx.doi.org/10.1140/epja/i2012-12074-9
ISSN:1434-601X
ISSN:1434-6001
Parent Title (English):The European physical journal A, Hadrons and nuclei
Publisher:Springer
Place of publication:Berlin ; Heidelberg
Document Type:Article
Language:English
Date of Publication (online):2012/05/29
Date of first Publication:2012/05/29
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2012/12/13
Volume:48
Issue:74
Pagenumber:17
First Page:1
Last Page:17
Note:
This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
Institutes:Physik
Dewey Decimal Classification:530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 3.0

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