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

J. L. Boyard (16) P. Cabanelas (18) S. Chernenko (7) A. Dybczak (3) E. Epple (10 L. Fabbietti (10 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 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 S. Lang (4) K. Lapidus (10 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 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 J. W\"ustenfeld (6) S. Yurevich (4) Y. Zanevsky (7) A. V. Sarantsev (19 28) V. A. Nikonov (19 ((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 (6) Institut f\"ur Strahlenphysik Helmholtz-Zentrum Dresden-Rossendorf 01314 Dresden (7) Joint Institute of Nuclear Research 141980 Dubna Russia (8) Institut f\"ur Kernphysik Goethe-Universit\"at 60438 Frankfurt (9) Excellence Cluster 'Origin Structure of the Universe' 85748 Garching (10) Physik Department E12 Technische Universit\"at M\"unchen (11) II.Physikalisches Institut Justus Liebig Universit\"at Giessen 35392 Giessen (12) Istituto Nazionale di Fisica Nucleare Sezione di Milano 20133 Milano (13) Institute for Nuclear Research Russian Academy of Science 117312 Moscow (14) Institute of Theoretical Experimental Physics 117218 Moscow (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 (20) Lawrence Berkeley National Laboratory Berkeley USA (21) ISEC Coimbra Coimbra (22) ExtreMe Matter Institute EMMI (23) Technische Universit\"at Dresden 01062 Dresden (24) Dipartimento di Fisica Universit\`a di Milano (25) Frederick University 1036 Nicosia (26) Dipartimento di Fisica INFN Universit\`a di Torino 10125 Torino (27) Utrecht University 3584 CC Utrecht The Netherlands (28) Helmholtz--Institut f\"ur Strahlen-- und Kernphysik Universit\"at Bonn Germany)