# Analysis of pion production data measured by HADES in proton-proton collisions at 1.25 GeV **Authors:** G. Agakishiev (7), A. Balanda (3), D. Belver (18), A. Belyaev (7), J., C. Berger-Chen (10,9), A. Blanco (2), M. B\"ohmer (10), J. L. Boyard (16), P., Cabanelas (18), S. Chernenko (7), A. Dybczak (3), E. Epple (10,9), L., Fabbietti (10,9), O. Fateev (7), P. Finocchiaro (1), P. Fonte (2,21), J., Friese (10), I. Fr\"ohlich (8), T. Galatyuk (5,22), J. A. Garz\'on (18), R., Gernh\"auser (10), K. G\"obel (8), M. Golubeva (13), D. Gonz\'alez-D\'iaz, (5), F. Guber (13), M. Gumberidze (5,22), T. Heinz (4), T. Hennino (16), R., Holzmann (4), A. Ierusalimov (7), I. Iori (12,24), A. Ivashkin (13), M., Jurkovic (10), B. K\"ampfer (6,23), T. Karavicheva (13), I. Koenig (4), W., Koenig (4), B. W. Kolb (4), G. Kornakov (5), R. Kotte (6), A. Kr\'asa (17),, F. Krizek (17), R. Kr\"ucken (10), H. Kuc (3,16), W. K\"uhn (11), A. Kugler, (17), A. Kurepin (13), V. Ladygin (7), R. Lalik (10,9), S. Lang (4), K., Lapidus (10,9), A. Lebedev (14), T. Liu (16), L. Lopes (2), M. Lorenz (8,27),, L. Maier (10), A. Mangiarotti (2), J. Markert (8), V. Metag (11), B., Michalska (3), J. Michel (8), C. M\"untz (8), R. M\"unzer (10,9), L. Naumann, (6), Y. C. Pachmayer (8), M. Palka (3), Y. Parpottas (15,25), V. Pechenov, (4), O. Pechenova (8), J. Pietraszko (4), W. Przygoda (3), B. Ramstein (16),, A. Reshetin (13), A. Rustamov (8), A. Sadovsky (13), P. Salabura (3), A., Schmah (20), E. Schwab (4), J. Siebenson (10), Yu.G. Sobolev (17), S. Spataro, (26), B. Spruck (11), H. Str\"obele (8), J. Stroth (8,4), C. Sturm (4), A., Tarantola (8), K. Teilab (8), P. Tlusty (17), M. Traxler (4), R. Trebacz (3),, H. Tsertos (15), T. Vasiliev (7), V. Wagner (17), M. Weber (10), C. Wendisch, (6,23), J. W\"ustenfeld (6), S. Yurevich (4), Y. Zanevsky (7), A. V., Sarantsev (19,28), V. A. Nikonov (19,28), ((1) Istituto Nazionale di Fisica, Nucleare - Laboratori Nazionali del Sud, 95125 Catania, Italy, (2), LIP-Laborat\'orio de Instrumenta\c{c}\~ao e F\'isica Experimental de, Part\'iculas, 3004-516 Coimbra, Portugal, (3) Smoluchowski Institute of, Physics, Jagiellonian University of Cracow, 30-059 Krak\'ow, Poland, (4) GSI, Helmholtzzentrum f\"ur Schwerionenforschung GmbH, 64291 Darmstadt, Germany,, (5) Technische Universit\"at Darmstadt, 64289 Darmstadt, Germany, (6), Institut f\"ur Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314, Dresden, Germany, (7) Joint Institute of Nuclear Research, 141980 Dubna,, Russia, (8) Institut f\"ur Kernphysik, Goethe-Universit\"at, 60438 Frankfurt,, Germany, (9) Excellence Cluster 'Origin, Structure of the Universe', 85748, Garching, Germany, (10) Physik Department E12, Technische Universit\"at, M\"unchen, 85748 Garching, Germany, (11) II.Physikalisches Institut, Justus, Liebig Universit\"at Giessen, 35392 Giessen, Germany, (12) Istituto Nazionale, di Fisica Nucleare, Sezione di Milano, 20133 Milano, Italy, (13) Institute, for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia, (14), Institute of Theoretical, Experimental Physics, 117218 Moscow, Russia,, (15) Department of Physics, University of Cyprus, 1678 Nicosia, Cyprus, (16), Institut de Physique Nucl\'eaire, CNRS-IN2P3, Univ. Paris-Sud, Universit\'e, Paris-Saclay, 91406 Orsay Cedex, France, (17) Nuclear Physics Institute,, Academy of Sciences of Czech Republic, 25068 Rez, Czech Republic, (18), LabCAF. F. F\'isica, Univ. de Santiago de Compostela, 15706 Santiago de, Compostela, Spain, (19) NRC "Kurchatov Institute", PNPI, 188300, Gatchina,, Russia, (20) Lawrence Berkeley National Laboratory, Berkeley, USA, (21) ISEC, Coimbra, Coimbra, Portugal, (22) ExtreMe Matter Institute EMMI, 64291, Darmstadt, Germany, (23) Technische Universit\"at Dresden, 01062 Dresden,, Germany, (24) Dipartimento di Fisica, Universit\`a di Milano, 20133 Milano,, Italy, (25) Frederick University, 1036 Nicosia, Cyprus, (26) Dipartimento di, Fisica, INFN, Universit\`a di Torino, 10125 Torino, Italy, (27) Utrecht, University, 3584 CC Utrecht, The Netherlands, (28) Helmholtz--Institut f\"ur, Strahlen-- und Kernphysik, Universit\"at Bonn, Germany) arXiv: 1703.08398 · 2017-03-29 ## TL;DR This paper analyzes pion production in proton-proton collisions at 1.25 GeV using HADES data, employing partial wave analysis to identify resonance contributions and improve understanding of baryon resonance production mechanisms. ## Contribution It provides a detailed partial wave analysis of pion production data at 1.25 GeV, highlighting the roles of various baryon resonances and non-resonant processes. ## Key findings - Dominant contribution of Δ(1232) resonance - Significant impact of N(1440) resonance - Evidence of non-resonant partial waves ## Abstract Baryon resonance production in proton-proton collisions at a kinetic beam energy of 1.25 GeV is investigated. The multi-differential data were measured by the HADES collaboration. Exclusive channels with one pion in the final state ($np\pi^{+}$ and $pp\pi^{0}$) 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 $\Delta$(1232), yet with a sizable impact of the $N$(1440) and non-resonant partial waves. ## Full text _Full body text omitted from this summary view._ Fetch the complete paper as Markdown: https://tomesphere.com/paper/1703.08398/full.md ## Figures 63 figures with captions in the complete paper: https://tomesphere.com/paper/1703.08398/full.md ## References 45 references — full list in the complete paper: https://tomesphere.com/paper/1703.08398/full.md --- Source: https://tomesphere.com/paper/1703.08398