Physics Letters B (Nov 2015)
Study of the quasi-free np→npπ+π− reaction with a deuterium beam at 1.25 GeV/nucleon
- G. Agakishiev,
- A. Balanda,
- D. Belver,
- A.V. Belyaev,
- A. Blanco,
- M. Böhmer,
- J.L. Boyard,
- P. Braun-Munzinger,
- P. Cabanelas,
- E. Castro,
- S. Chernenko,
- T. Christ,
- M. Destefanis,
- J. Díaz,
- F. Dohrmann,
- A. Dybczak,
- L. Fabbietti,
- O.V. Fateev,
- P. Finocchiaro,
- P. Fonte,
- J. Friese,
- I. Fröhlich,
- T. Galatyuk,
- J.A. Garzón,
- R. Gernhäuser,
- A. Gil,
- C. Gilardi,
- K. Göbel,
- M. Golubeva,
- D. González-Díaz,
- F. Guber,
- M. Gumberidze,
- T. Hennino,
- R. Holzmann,
- A. Ierusalimov,
- I. Iori,
- A. Ivashkin,
- M. Jurkovic,
- B. Kämpfer,
- T. Karavicheva,
- D. Kirschner,
- I. Koenig,
- W. Koenig,
- B.W. Kolb,
- R. Kotte,
- F. Krizek,
- R. Krücken,
- W. Kühn,
- A. Kugler,
- A. Kurepin,
- A. Kurilkin,
- P. Kurilkin,
- V. Ladygin,
- S. Lang,
- J.S. Lange,
- K. Lapidus,
- T. Liu,
- L. Lopes,
- M. Lorenz,
- L. Maier,
- A. Mangiarotti,
- J. Markert,
- V. Metag,
- B. Michalska,
- J. Michel,
- E. Morinière,
- J. Mousa,
- C. Müntz,
- L. Naumann,
- J. Otwinowski,
- Y.C. 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,
- Yu.G. Sobolev,
- S. Spataro,
- B. Spruck,
- H. Ströbele,
- J. Stroth,
- C. Sturm,
- A. Tarantola,
- K. Teilab,
- P. Tlusty,
- M. Traxler,
- R. Trebacz,
- H. Tsertos,
- V. Wagner,
- T. Vasiliev,
- M. Weber,
- M. Wisniowski,
- T. Wojcik,
- J. Wüstenfeld,
- S. Yurevich,
- Y. Zanevsky,
- P. Zhou
Affiliations
- G. Agakishiev
- Joint Institute of Nuclear Research, 141980 Dubna, Russia
- A. Balanda
- Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland
- D. Belver
- LabCAF. Dpto. Física de Partículas, Univ. de Santiago de Compostela, 15706 Santiago de Compostela, Spain
- A.V. Belyaev
- Joint Institute of Nuclear Research, 141980 Dubna, Russia
- A. Blanco
- LIP-Laboratório de Instrumentação e Física Experimental de Partículas, 3004-516 Coimbra, Portugal
- M. Böhmer
- Physik Department E12, Technische Universität München, 85748 Garching, Germany
- J.L. Boyard
- Institut de Physique Nucléaire (UMR 8608), CNRS/IN2P3 – Université Paris Sud, F-91406 Orsay Cedex, France
- P. Braun-Munzinger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- P. Cabanelas
- LabCAF. Dpto. Física de Partículas, Univ. de Santiago de Compostela, 15706 Santiago de Compostela, Spain
- E. Castro
- LabCAF. Dpto. Física de Partículas, Univ. de Santiago de Compostela, 15706 Santiago de Compostela, Spain
- S. Chernenko
- Joint Institute of Nuclear Research, 141980 Dubna, Russia
- T. Christ
- Physik Department E12, Technische Universität München, 85748 Garching, Germany
- M. Destefanis
- II. Physikalisches Institut, Justus Liebig Universität Giessen, 35392 Giessen, Germany
- J. Díaz
- Instituto de Física Corpuscular, Universidad de Valencia-CSIC, 46971 Valencia, Spain
- F. Dohrmann
- Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
- A. Dybczak
- Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland
- L. Fabbietti
- Excellence Cluster ‘Origin and Structure of the Universe’ , 85748 Garching, Germany
- O.V. Fateev
- Joint Institute of Nuclear Research, 141980 Dubna, Russia
- P. Finocchiaro
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, 95125 Catania, Italy
- P. Fonte
- LIP-Laboratório de Instrumentação e Física Experimental de Partículas, 3004-516 Coimbra, Portugal
- J. Friese
- Physik Department E12, Technische Universität München, 85748 Garching, Germany
- I. Fröhlich
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- T. Galatyuk
- Technische Universität Darmstadt, 64289 Darmstadt, Germany
- J.A. Garzón
- LabCAF. Dpto. Física de Partículas, Univ. de Santiago de Compostela, 15706 Santiago de Compostela, Spain
- R. Gernhäuser
- Physik Department E12, Technische Universität München, 85748 Garching, Germany
- A. Gil
- Instituto de Física Corpuscular, Universidad de Valencia-CSIC, 46971 Valencia, Spain
- C. Gilardi
- II. Physikalisches Institut, Justus Liebig Universität Giessen, 35392 Giessen, Germany
- K. Göbel
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- M. Golubeva
- Institute for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia
- D. González-Díaz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- F. Guber
- Institute for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia
- M. Gumberidze
- Technische Universität Darmstadt, 64289 Darmstadt, Germany
- T. Hennino
- Institut de Physique Nucléaire (UMR 8608), CNRS/IN2P3 – Université Paris Sud, F-91406 Orsay Cedex, France
- R. Holzmann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- A. Ierusalimov
- Joint Institute of Nuclear Research, 141980 Dubna, Russia
- I. Iori
- Istituto Nazionale di Fisica Nucleare, Sezione di Milano, 20133 Milano, Italy
- A. Ivashkin
- Institute for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia
- M. Jurkovic
- Physik Department E12, Technische Universität München, 85748 Garching, Germany
- B. Kämpfer
- Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
- T. Karavicheva
- Institute for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia
- D. Kirschner
- II. Physikalisches Institut, Justus Liebig Universität Giessen, 35392 Giessen, Germany
- I. Koenig
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- W. Koenig
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- B.W. Kolb
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- R. Kotte
- Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
- F. Krizek
- Nuclear Physics Institute, Academy of Sciences of Czech Republic, 25068 Rez, Czech Republic
- R. Krücken
- Physik Department E12, Technische Universität München, 85748 Garching, Germany
- W. Kühn
- II. Physikalisches Institut, Justus Liebig Universität Giessen, 35392 Giessen, Germany
- A. Kugler
- Nuclear Physics Institute, Academy of Sciences of Czech Republic, 25068 Rez, Czech Republic
- A. Kurepin
- Institute for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia
- A. Kurilkin
- Joint Institute of Nuclear Research, 141980 Dubna, Russia
- P. Kurilkin
- Joint Institute of Nuclear Research, 141980 Dubna, Russia
- V. Ladygin
- Joint Institute of Nuclear Research, 141980 Dubna, Russia
- S. Lang
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- J.S. Lange
- II. Physikalisches Institut, Justus Liebig Universität Giessen, 35392 Giessen, Germany
- K. Lapidus
- Excellence Cluster ‘Origin and Structure of the Universe’ , 85748 Garching, Germany
- T. Liu
- Institut de Physique Nucléaire (UMR 8608), CNRS/IN2P3 – Université Paris Sud, F-91406 Orsay Cedex, France
- L. Lopes
- LIP-Laboratório de Instrumentação e Física Experimental de Partículas, 3004-516 Coimbra, Portugal
- M. Lorenz
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- L. Maier
- Physik Department E12, Technische Universität München, 85748 Garching, Germany
- A. Mangiarotti
- LIP-Laboratório de Instrumentação e Física Experimental de Partículas, 3004-516 Coimbra, Portugal
- J. Markert
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- V. Metag
- II. Physikalisches Institut, Justus Liebig Universität Giessen, 35392 Giessen, Germany
- B. Michalska
- Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland
- J. Michel
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- E. Morinière
- Institut de Physique Nucléaire (UMR 8608), CNRS/IN2P3 – Université Paris Sud, F-91406 Orsay Cedex, France
- J. Mousa
- Department of Physics, University of Cyprus, 1678 Nicosia, Cyprus
- C. Müntz
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- L. Naumann
- Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
- J. Otwinowski
- Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland
- Y.C. Pachmayer
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- M. Palka
- Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland
- Y. Parpottas
- Department of Physics, University of Cyprus, 1678 Nicosia, Cyprus
- V. Pechenov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- O. Pechenova
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- J. Pietraszko
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- W. Przygoda
- Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland
- B. Ramstein
- Institut de Physique Nucléaire (UMR 8608), CNRS/IN2P3 – Université Paris Sud, F-91406 Orsay Cedex, France
- A. Reshetin
- Institute for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia
- A. Rustamov
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- A. Sadovsky
- Institute for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia
- P. Salabura
- Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland
- A. Schmah
- Physik Department E12, Technische Universität München, 85748 Garching, Germany
- E. Schwab
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- Yu.G. Sobolev
- Nuclear Physics Institute, Academy of Sciences of Czech Republic, 25068 Rez, Czech Republic
- S. Spataro
- II. Physikalisches Institut, Justus Liebig Universität Giessen, 35392 Giessen, Germany
- B. Spruck
- II. Physikalisches Institut, Justus Liebig Universität Giessen, 35392 Giessen, Germany
- H. Ströbele
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- J. Stroth
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- C. Sturm
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- A. Tarantola
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- K. Teilab
- Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
- P. Tlusty
- Nuclear Physics Institute, Academy of Sciences of Czech Republic, 25068 Rez, Czech Republic
- M. Traxler
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- R. Trebacz
- Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland
- H. Tsertos
- Department of Physics, University of Cyprus, 1678 Nicosia, Cyprus
- V. Wagner
- Nuclear Physics Institute, Academy of Sciences of Czech Republic, 25068 Rez, Czech Republic
- T. Vasiliev
- Joint Institute of Nuclear Research, 141980 Dubna, Russia
- M. Weber
- Physik Department E12, Technische Universität München, 85748 Garching, Germany
- M. Wisniowski
- Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland
- T. Wojcik
- Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland
- J. Wüstenfeld
- Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
- S. Yurevich
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- Y. Zanevsky
- Joint Institute of Nuclear Research, 141980 Dubna, Russia
- P. Zhou
- Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
- DOI
- https://doi.org/10.1016/j.physletb.2015.09.016
- Journal volume & issue
-
Vol. 750,
no. C
pp. 184 – 193
Abstract
The tagged quasi-free np→npπ+π− reaction has been studied experimentally with the High Acceptance Di-Electron Spectrometer (HADES) at GSI at a deuteron incident beam energy of 1.25 GeV/nucleon (s∼2.42 GeV/c for the quasi-free collision). For the first time, differential distributions of solid statistics for π+π− production in np collisions have been collected in the region corresponding to the large transverse momenta of the secondary particles. The invariant mass and angular distributions for the np→npπ+π− reaction are compared with different models. This comparison confirms the dominance of the t-channel with ΔΔ contribution. It also validates the changes previously introduced in the Valencia model to describe two-pion production data in other isospin channels, although some deviations are observed, especially for the π+π− invariant mass spectrum. The extracted total cross section is also in much better agreement with this model. Our new measurement puts useful constraints for the existence of the conjectured dibaryon resonance at mass M∼2.38 GeV and with width Γ∼70 MeV.
Keywords
