Measurement of the quasi free np → npπ+π− and np → ppπ−π0 reactions at 1.25 GeV With HADES

A. Kurilkin; O. Arnold; E. T. Atomssa; C. Behnke; A. Belyaev; J. C. Berger-Chen; J. Biernat; A. Blanco; C. Blume; M. Böhmer; P. Bordalo; S. Chernenko; C. Deveaux; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Fonte; C. Franco; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; K. Gill; M. Golubeva; D. González-Díaz; F. Guber; M. Gumberidze; S. Harabasz; T. Hennino; C. Höhne; R. Holzmann; A. Ierusalimov; A. Ivashkin; M. Jurkovic; B. Kämpfer; T. Karavicheva; K. Kardan; I. Koenig; W. Koenig; B. W. Kolb; G. Korcyl; G. Kornakov; R. Kotte; A. Krása; E. Krebs; F. Krizek; H. Kuc; A. Kugler; T. Kunz; A. Kurepin; P. Kurilkin; V. Ladygin; R. Lalik; S. Lang; K. Lapidus; A. Lebedev; L. Lopes; M. Lorenz; L. Maier; A. Mangiarotti; J. Markert; V. Metag; J. Michel; C. Müntz; R. Münzer; L. Naumann; M. Palka; V. Pechenov; O. Pechenova; V. Petousis; J. Pietraszko; W. Przygoda; B. Ramstein; L. Rehnisch; A. Reshetin; A. Rost; A. Rustamov; A. Sadovsky; P. Salabura; T. Scheib; K. Schmidt-Sommerfeld; H. Schuldes; P. Sellheim; J. Siebenson; L. Silva; Yu. G. Sobolev; S. Spataro; H. Ströbele; J. Stroth; P. Strzempek; C. Sturm; O. Svoboda; A. Tarantola; K. Teilab; P. Tlusty; M. Traxler; H. Tsertos; T. Vasiliev; V. Wagner; C. Wendisch; J. Wirth; J. Wüstenfeld; S. Yurevich; Y. Zanevsky

doi:10.1051/epjconf/20148102009

Proceedings

Open Access

EPJ Web of Conferences 81, 02009 (2014)
https://doi.org/10.1051/epjconf/20148102009

Measurement of the quasi free np → npπ⁺π⁻ and np → ppπ⁻π⁰ reactions at 1.25 GeV With HADES

A. Kurilkin⁶^a, O. Arnold⁹^,8, E. T. Atomssa¹⁴, C. Behnke⁷, A. Belyaev⁶, J. C. Berger-Chen⁹^,8, J. Biernat², A. Blanco¹, C. Blume⁷, M. Böhmer⁹, P. Bordalo¹, S. Chernenko⁶, C. Deveaux¹⁰, A. Dybczak², E. Epple⁹^,8, L. Fabbietti⁹^,8, O. Fateev⁶, P. Fonte¹^,17, C. Franco¹, J. Friese⁹, I. Fröhlich⁷, T. Galatyuk⁴^,18, J. A. Garzón¹⁶, K. Gill⁷, M. Golubeva¹¹, D. González-Díaz⁴, F. Guber¹¹, M. Gumberidze⁴^,18, S. Harabasz⁴^,2, T. Hennino¹⁴, C. Höhne¹⁰, R. Holzmann³, A. Ierusalimov⁶, A. Ivashkin¹¹, M. Jurkovic⁹, B. Kämpfer⁵^,19, T. Karavicheva¹¹, K. Kardan⁷, I. Koenig³, W. Koenig³, B. W. Kolb³, G. Korcyl², G. Kornakov⁴, R. Kotte⁵, A. Krása¹⁵, E. Krebs⁷, F. Krizek¹⁵, H. Kuc²^,14, A. Kugler¹⁵, T. Kunz⁹, A. Kurepin¹¹, P. Kurilkin⁶, V. Ladygin⁶, R. Lalik⁹^,8, S. Lang³, K. Lapidus⁹^,8, A. Lebedev¹², L. Lopes¹, M. Lorenz⁷, L. Maier⁹, A. Mangiarotti¹, J. Markert⁷, V. Metag¹⁰, J. Michel⁷, C. Müntz⁷, R. Münzer⁹^,8, L. Naumann⁵, M. Palka², V. Pechenov³, O. Pechenova⁷, V. Petousis¹³, J. Pietraszko³, W. Przygoda², B. Ramstein¹⁴, L. Rehnisch⁷, A. Reshetin¹¹, A. Rost⁴, A. Rustamov⁷, A. Sadovsky¹¹, P. Salabura², T. Scheib⁷, K. Schmidt-Sommerfeld⁹, H. Schuldes⁷, P. Sellheim⁷, J. Siebenson⁹, L. Silva¹, Yu. G. Sobolev¹⁵, S. Spataro²⁰, H. Ströbele⁷, J. Stroth⁷^,3, P. Strzempek², C. Sturm³, O. Svoboda¹⁵, A. Tarantola⁷, K. Teilab⁷, P. Tlusty¹⁵, M. Traxler³, H. Tsertos¹³, T. Vasiliev⁶, V. Wagner¹⁵, C. Wendisch⁵^,19, J. Wirth⁹^,8, J. Wüstenfeld⁵, S. Yurevich³ and Y. Zanevsky⁶ for the HADES Collaboration

¹ LIP-Laboratório de Instrumentação e Física Experimental de Partículas, 3004-516 Coimbra, Portugal
² Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland
³ GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
⁴ Technische Universität Darmstadt, 64289 Darmstadt, Germany
⁵ Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
⁶ Joint Institute for Nuclear Research, 141980 Dubna, Russia
⁷ Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
⁸ Excellence Cluster ’Origin and Structure of the Universe’, 85748 Garching, Germany
⁹ Physik Department E12, Technische Universität München, 85748 Garching, Germany
¹⁰ II.Physikalisches Institut, Justus Liebig Universität Giessen, 35392 Giessen, Germany
¹¹ Institute for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia
¹² Institute of Theoretical and Experimental Physics, 117218 Moscow, Russia
¹³ Department of Physics, University of Cyprus, 1678 Nicosia, Cyprus
¹⁴ Institut de Physique Nucléaire (UMR 8608), CNRS/IN2P3 - Université Paris Sud, F-91406 Orsay Cedex, France
¹⁵ Nuclear Physics Institute, Academy of Sciences of Czech Republic, 25068 Rez, Czech Republic
¹⁶ LabCAF. F. Física, Univ. de Santiago de Compostela, 15706 Santiago de Compostela, Spain
¹⁷ Also at ISEC Coimbra, Coimbra, Portugal
¹⁸ Also at ExtreMe Matter Institute EMMI, 64291 Darmstadt, Germany
¹⁹ Also at Technische Universität Dresden, 01062 Dresden, Germany
²⁰ Also at Dipartimento di Fisica and INFN, Università di Torino, 10125 Torino, Italy

^a e-mail: akurilkin@jinr.ru

Published online: 26 November 2014

Abstract

We present the results of two-pion production in tagged quasi-free np collisions at a deutron incident beam energy of 1.25 GeV/c measured with the High-Acceptance Di-Electron Spectrometer (HADES) installed at GSI. The specific acceptance of HADES allowed for the first time to obtain high-precision data on π⁺π⁻ and π⁻π⁰ production in np collisions in a region corresponding to large transverse momenta of the secondary particles. The obtained differential cross section data provide strong constraints on the production mechanisms and on the various baryon resonance contributions (∆∆, N(1440), N(1520), ∆(1600)). The invariant mass and angular distributions from the np → npπ⁺π ⁻and np → ppπ⁻π⁰ reactions are compared with different theoretical model predictions.

© Owned by the authors, published by EDP Sciences, 2014

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