Analysis of pion production data measured by HADES in proton-proton collisions at 1.25 GeV

/ Authors

G. Agakishiev, A. Balanda, D. Belver, A. Belyaev, J. Berger-chen, A. Blanco, M. Bohmer, J. Boyard, P. Cabanelas, S. Chernenko

and 173 more authors

A. Dybczak, E. Epple, L. Fabbietti, O. Fateev, P. Finocchiaro, P. Fonte, J. Friese, I. Frohlich, T. Galatyuk, J. A. Garzón, R. Gernhauser, K. Gobel, M. Golubeva, D. Gonz'alez-D'iaz, F. Guber, M. Gumberidze, T. Heinz, T. Hennino, R. Holzmann, A. Ierusalimov, I. Iori, A. Ivashkin, M. Jurkovič, B. Kampfer, T. Karavicheva, I. Koenig, W. Koenig, B. Kolb, G. Kornakov, R. Kotte, A. Krása, F. Krizek, R. Krucken, H. Kuc, W. Kuhn, A. Kugler, A. Kurepin, V. Ladygin, R. Lalik, S. Lang, K. Lapidus, A. Lebedev, T. Liu, L. Lopes, M. Lorenz, L. Maier, A. Mangiarotti, J. Markert, V. Metag, B. Michalska, J. Michel, C. Muntz, R. Munzer, L. Naumann, Y. Pachmayer, M. Palka, Y. Parpottas, V. Pechenov, O. Pechenova, J. Pietraszko, W. Przygoda, B. Ramstein, A. Reshetin, A. Rustamov, A. Sadovsky, P. Salabura, A. Schmah, E. Schwab, J. Siebenson, Y. Sobolev, S. Spataro, B. Spruck, H. Strobele, J. Stroth, C. Sturm, A. Tarantola, K. Teilab, P. Tlustý, M. Traxler, R. Trebacz, H. Tsertos, T. Vasiliev, V. Wagner, M. Weber, C. Wendisch, J. Wustenfeld, S. Yurevich, Y. Zanevsky, A. Sarantsev, V. Nikonov, Istituto Nazionale di Fisica Nucleare - Laboratori Nazional Sud, 95125 Catania, Italy, L. D. I. E. F. E. D. Part'iculas, 3004-516 Coimbra, Portugal, S. I. O. Physics, Jagiellonian University of Cracow, 31-342 Krak'ow, Poland., Gsi GmbH, 64291 Darmstadt, Germany, T. U. Darmstadt, 64291 Darmstadt, Institut fur Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, J. I. O. N. Research, 141980 Dubna, Russia., I. F. Kernphysik, Goethe-Universitat, 60438 Frankfurt, Excellence Cluster 'Origin, Structure of the Universe', 85748 Garching, Physik Department E12, T. U. Munchen, I. Institut, Justus-Liebig-University Giessen, 35392 Giessen, Istituto Nazionale Fisica Nucleare, Sezione Infn di Milano, 20133 Milano, Inst. for Nucl. Research, R. Science, 117997 Moscow, Institute of Theoretical, E. Physics, 117997 Moscow, Department of Applied Physics, U. Cyprus, 1036 Nicosia, Cyprus., Institut de Physique Nucl'eaire, CNRS-IN2P3., U. Paris-sud, Universit'e Paris-Saclay, 91405 Orsay Cedex, France, Nuclear Physics Institute, Academy of Sciences of the Czech Republic, 25068 Rez, Czech Republic, LabCAF. F. F'isica, U. S. D. Compostela, 15706 Santiago de Compostela, Spain., N. Institute, Pnpi, 188300, Gatchina, L. B. N. Laboratory, Berkeley, Usa, Isec Coimbra, Coimbra, ExtreMe Matter Institute Emmi, T. U. Dresden, 01314 Dresden, D. Fisica, U. Milano, F. University, 1036 Nicosia, Infn, U. Torino, 10125 Torino, Utrecht University, 3584 CC Utrecht, The Netherlands., H. S. M. F. Kernphysik, U. Bonn

/ Abstract

Baryon resonance production in proton-proton collisions at a kinetic beam energy of 1.25GeV is investigated. The multi-differential data were measured by the HADES Collaboration. Exclusive channels with one pion in the final state (npπ+ and ppπ0 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. The results of the PWA confirm the dominant contribution of the Δ(1232), yet with a sizable impact of the N (1440) and non-resonant partial waves.

Journal: The European Physical Journal A

DOI: 10.1140/epja/i2015-15137-5