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1. Charge symmetry breaking in dd→He4π0 with WASA-at-COSY

Author

P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, F.S. Bergmann, M. Berłowski, H. Bhatt, A. Bondar, M. Büscher, H. Calén, I. Ciepał, H. Clement, D. Coderre, E. Czerwiński, K. Demmich, E. Doroshkevich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Föhl, K. Fransson, F. Goldenbaum, P. Goslawski, A. Goswami, K. Grigoryev, C.-O. Gullström, C. Hanhart, F. Hauenstein, L. Heijkenskjöld, V. Hejny, B. Höistad, N. Hüsken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, F.A. Khan, A. Khoukaz, D.A. Kirillov, S. Kistryn, H. Kleines, B. Kłos, W. Krzemień, P. Kulessa, A. Kupść, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Mariański, M. Mikirtychiants, H.-P. Morsch, P. Moskal, H. Ohm, I. Ozerianska, E. Perez del Rio, N.M. Piskunov, P. Podkopał, D. Prasuhn, A. Pricking, D. Pszczel, K. Pysz, A. Pyszniak, C.F. Redmer, J. Ritman, A. Roy, Z. Rudy, S. Sawant, S. Schadmand, T. Sefzick, V. Serdyuk, B. Shwartz, R. Siudak, T. Skorodko, M. Skurzok, J. Smyrski, V. Sopov, R. Stassen, J. Stepaniak, E. Stephan, G. Sterzenbach, H. Stockhorst, H. Ströher, A. Szczurek, A. Täschner, A. Trzciński, R. Varma, M. Wolke, A. Wrońska, P. Wüstner, P. Wurm, A. Yamamoto, L. Yurev, J. Zabierowski, M.J. Zieliński, A. Zink, J. Złomańczuk, P. Żuprański, and M. Żurek

Subjects
Physics, QC1-999
Abstract

Charge symmetry breaking (CSB) observables are a suitable experimental tool to examine effects induced by quark masses on the nuclear level. Previous high precision data from TRIUMF and IUCF are currently used to develop a consistent description of CSB within the framework of chiral perturbation theory. In this work the experimental studies on the reaction dd→He4π0 have been extended towards higher excess energies in order to provide information on the contribution of p-waves in the final state. For this, an exclusive measurement has been carried out at a beam momentum of pd=1.2 GeV/c using the WASA-at-COSY facility. The total cross section amounts to σtot=(118±18stat±13sys±8ext) pb and first data on the differential cross section are consistent with s-wave pion production. Keywords: Charge symmetry breaking, Deuteron–deuteron interactions, Pion production

Published
2014
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2. Differential cross sections for neutron-proton scattering in the region of the d*(2380) dibaryon resonance

Author

C.-O. Gullström, Markus Büscher, D. Pszczel, P. Podkopał, Pawel Marciniewski, S. Sawant, Paweł Moskal, R. Varma, P. Fedorets, I. Ozerianska, R. Maier, A. Švarc, J. Ritman, W. Eyrich, T. Sefzick, V. Serdyuk, P. Goslawski, E. Stephan, Jerzy Smyrski, P. Kulessa, N. Hüsken, B. Kamys, V. Hejny, K. Föhl, R. Engels, A. Pricking, P. Wüstner, H. Clement, Günter Kemmerling, A. Kupść, M. Mikirtychiants, A. Pyszniak, W. Augustyniak, D. Lersch, Izabela Ciepał, A. Goswami, Magdalena Skurzok, M. Bashkanov, Frank Goldenbaum, M. Krapp, K. Demmich, K. Pysz, B. Kłos, A. Magiera, Ferdous Khan, J. Zabierowski, Akira Yamamoto, Hans Stockhorst, M. Berłowski, A. Erven, H. Ströher, W. Erven, G. Sterzenbach, Antoni Szczurek, B. Lorentz, Rolf Stassen, Tord Johansson, K. Fransson, H. P. Morsch, Zbigniew Rudy, T. Skorodko, V. Sopov, H. Ohm, K. Grigoryev, A. Trzcinski, A. Khoukaz, S. Schadmand, P. Żuprański, A. Zink, Jozef Zlomanczuk, B. Mariański, R. Siudak, A. Täschner, I. I. Strakovsky, E. Doroshkevich, Aleksandra Wrońska, A. Jany, K. Lalwani, Eryk Czerwiński, Hans Calén, Stanisław Kistryn, W. Bardan, W. J. Briscoe, E. Perez del Rio, Ankhi Roy, Wojciech Krzemien, M. Hodana, J. Stepaniak, C. F. Redmer, F. S. Bergmann, Magnus Wolke, Harald Kleines, Di. Kirillov, F. Hauenstein, Lena Heijkenskjöld, D. Prasuhn, P. Wurm, Patrik Adlarson, Bo Höistad, D. Coderre, L. Yurev, Benedykt R. Jany, Himani Bhatt, N.M. Piskunov, Ron L. Workman, M. Żurek, and Marcin Zieliński

Subjects
Physics, Nuclear physics, Range (particle radiation), Hydrogen, chemistry, Deuterium, Scattering, chemistry.chemical_element, Neutron, Nuclear Experiment, Resonance (particle physics), Beam (structure), Differential (mathematics)
Abstract

Differential cross sections have been extracted from exclusive and kinematically complete high-statistics measurements of quasifree polarized np scattering performed in the energy region of the d*(2380) dibaryon resonance covering the range of beam energies Tn=0.98−1.29 GeV (s=2.32−2.44 GeV). The experiment was carried out with the WASA-at-COSY setup having a polarized deuteron beam impinged on the hydrogen pellet target and utilizing the quasifree process dp→np+pspectator. In this way the np differential cross section σ(Θ) was measured over a large angular range. The obtained angular distributions complement the corresponding analyzing power Ay(Θ) measurements published previously. A SAID partial-wave analysis incorporating the new data strengthens the finding of a resonance pole in the coupled D33-G33 waves.

Published
2020

4. Charge symmetry breaking in dd→He4π0 with WASA-at-COSY

Author

Izabela Ciepał, H. Bhatt, Hans Stockhorst, V. Sopov, D. Lersch, Marcin Zieliński, Rolf Stassen, A. Pricking, Bo Höistad, Jozef Zlomanczuk, A.S. Kuzmin, C.-O. Gullström, Markus Büscher, C. F. Redmer, A. Goswami, E. Doroshkevich, B. Mariański, Aleksandra Wrońska, E. Perez del Rio, P. Goslawski, K. Demmich, P. Wurm, H. Clement, K. Lalwani, Stanisław Kistryn, W. Eyrich, D. Coderre, R. Varma, M. Berłowski, A. Pyszniak, W. Augustyniak, K. Föhl, I. Ozerianska, W. Bardan, L. Yurev, P. Podkopał, S. Sawant, Lena Heijkenskjöld, F. S. Bergmann, A. Zink, Zbigniew Rudy, F. Hauenstein, D. Prasuhn, Paweł Moskal, R. Siudak, Magnus Wolke, T. Skorodko, N. Hüsken, Ankhi Roy, R. Maier, J. Stepaniak, W. Erven, P. Kulessa, Eryk Czerwiński, V. Hejny, S. Schadmand, Akira Yamamoto, A. Kupść, B. Kamys, T. Sefzick, Harald Kleines, P. Wüstner, K. Grigoryev, P. Adlarson, Christoph Hanhart, H. Ströher, E. Stephan, N.M. Piskunov, T. Johansson, M. Żurek, L. Jarczyk, B. Kłos, Wojciech Krzemien, K. Pysz, P. Fedorets, Ferdous Khan, Pawel Marciniewski, H. Ohm, V. Serdyuk, B.A. Shwartz, A. Khoukaz, H. P. Morsch, Jerzy Smyrski, M. Mikirtychiants, Magdalena Skurzok, M. Bashkanov, Günter Kemmerling, A. Trzciński, A. Erven, G. Sterzenbach, B. Lorentz, D. Pszczel, Ralf Engels, A. Täschner, A. Magiera, James Ritman, Frank Goldenbaum, P. Żuprański, A.E. Bondar, Hans Calén, Di. Kirillov, J. Zabierowski, Kjell Fransson, and Antoni Szczurek

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Chiral perturbation theory, 010308 nuclear & particles physics, Nuclear Theory, Observable, Charge (physics), 01 natural sciences, Nuclear physics, 0103 physical sciences, Sum rule in quantum mechanics, Symmetry breaking, Nuclear Experiment, 010306 general physics
Abstract

Charge symmetry breaking (CSB) observables are a suitable experimental tool to examine effects induced by quark masses on the nuclear level. Previous high precision data from TRIUMF and IUCF are cu ...

Published
2014

5. Exclusive measurement of the η→π+π−γ decay

Author

Paweł Moskal, B. Lorentz, A. Magiera, Ulf-G. Meißner, M. Berłowski, H. P. Morsch, C. Adolph, C.-O. Gullström, Markus Büscher, B. Kamys, Benedykt R. Jany, A. Winnemöller, Jozef Zlomanczuk, James Ritman, Joanna Klaja, M. Mikirtychiants, D. Coderre, P. Wüstner, P. Goslawski, Magdalena Skurzok, R. Maier, G. J. Wagner, S. Schadmand, H. Clement, P. Fedorets, G. Sterzenbach, Günter Kemmerling, Bo Höistad, Paweł Podkopał, W. Eyrich, F. Stollenwerk, J. Heimlich, L. Jarczyk, A. Trzciński, T. Skorodko, A. Schmidt, Aleksandra Wrońska, A. Povtoreyko, E. Perez del Rio, X. Yuan, Tomasz Bednarski, Annika Passfeld, Zbigniew Rudy, H. Bhatt, W. Erven, Basanta Kumar Nandi, T. Sefzick, Stanisław Kistryn, J. Stepaniak, R. Engels, A. Pricking, D. Prasuhn, K. Föhl, R. Varma, P. Wurm, Andreas Wirzba, P. Pluciński, Eryk Czerwiński, K. T Brinkmann, K. Grigoryev, C. Zheng, Szymon Niedźwiecki, Harald Kleines, P. Vlasov, M. Hodana, W. Zipper, Lena Heijkenskjöld, W. Bardan, C. F. Redmer, P. Adlarson, P. Kulessa, T. Tolba, V. Serdyuk, R. Siudak, Hans Stockhorst, L. Yurev, Pawel Marciniewski, A. Täschner, H. Ohm, K. Pysz, T. Rausmann, Rolf Stassen, Christoph Hanhart, E. Doroshkevich, J. Zabierowski, F. Hinterberger, A. Jany, M. Siemaszko, Antoni Szczurek, Wojciech Krzemien, V. Sopov, F. S. Bergmann, Magnus Wolke, F. Kren, Jerzy Smyrski, Hans Calén, Kjell Fransson, T. Johansson, Frank Goldenbaum, B. Kłos, W. Węglorz, A. Pyszniak, W. Augustyniak, V. Hejny, S. Sawant, A. Kupść, Carla Terschlüsen, M. Bashkanov, P. Żuprański, Stefan Leupold, K. Lalwani, Y. Petukhov, A. Khoukaz, N.M. Piskunov, Marek Jacewicz, C. Pauly, N. Shah, Marcin Zieliński, H. Ströher, Ankhi Roy, O. Khakimova, B. Mariański, and T. Petri

Subjects
Physics, Nuclear and High Energy Physics, Proton, Meson, 010308 nuclear & particles physics, Nuclear Theory, Eta meson, Hadron, 01 natural sciences, 7. Clean energy, Nuclear physics, Pion, Helium-3, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Isotopes of helium, Dimensionless quantity
Abstract

An exclusive measurement of the decay eta -> pi(+) pi(-) gamma has been performed at the WASA facility at COSY. The eta mesons were produced in the fusion reaction pd -> He-3 X at a proton be ...

Published
2012

6. π0π0 Production in proton–proton collisions at Tp=1.4 GeV

Author

Aleksandra Wrońska, E. Perez del Rio, A. Povtoreyko, P. Wurm, G. J. Wagner, A. Taeschner, L. Yurev, P. Zupranski, X. Yuan, Pawel Plucinski, Ankhi Roy, W. Eyrich, P. Kulessa, C. Zheng, C. F. Redmer, B. Kamys, Stanisław Kistryn, Annika Passfeld, W. Węglorz, A. Khoukaz, M. Hodana, M. Berłowski, A. Magiera, C. Adolph, P. Podkopał, Ulrich Wiedner, W. Augustyniak, A. Pricking, F. Goldenbaum, Lena Heijkenskjöld, James Ritman, Jozef Zlomanczuk, Hans Stockhorst, Basanta Kumar Nandi, D. Prasuhn, Marek Jacewicz, Ralf Engels, H. Bhatt, H. P. Morsch, N.M. Piskunov, C. Pauly, R. Maier, Bo Höistad, M. Buescher, F. Hinterberger, T. Skorodko, Benedykt R. Jany, A. Schmidt, K. Lalwani, W. Erven, T. Sefzick, M. Bashkanov, Paweł Moskal, A. Winnemoeller, S. Schadmand, P. Vlasov, W. Zipper, Zbigniew Rudy, Eryk Czerwiński, G. Kemmerling, Y. Petukhov, T. Tolba, R. Stassen, V. Serdyuk, Pawel Marciniewski, V. Hejny, Jerzy Smyrski, P. Goslawski, B. Kłos, H. Clement, S. Sawant, K. Foehl, C.-O. Gullström, N. Shah, Andrzej Kupsc, L. Jarczyk, J. Stepaniak, H. Kleines, G. Sterzenbach, J. Heimlich, Bernd Lorentz, E. Doroshkevich, K. Pysz, F. S. Bergmann, Magnus Wolke, Hans Calén, A. Jany, A. Trzciński, Tomasz Bednarski, R. Varma, K. Grigoryev, M. Siemaszko, Kjell Fransson, P. Fedorets, J. Klaja, D. Coderre, V. Sopov, F. Kren, S. Niedzwiecki, Wojciech Krzemien, H. Stroeher, Marcin Zieliński, J. Zabierowski, Antoni Szczurek, M. Mikirtychiants, Magdalena Skurzok, T. Rausmann, O. Khakimova, B. Mariański, P. Wuestner, Patrik Adlarson, Tord Johansson, H. Ohm, Michał Janusz, and K. T Brinkmann

Subjects
Physics, Baryon, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Pion, Meson, Proton, Hadron, Pi, Elementary particle, Nucleon
Abstract

The reaction pp -> pp pi(0)pi(0) has been investigated at a beam energy of 1.4 GeV using the WASA-at-COSY facility. The total cross section is found to be (324 +/- 21(systematic) +/- 58(normaliz ...

Published
2012

7. Measurement of the η→3π0 Dalitz plot distribution with the WASA detector at COSY

Author

H. Schneider, Paweł Klaja, R. Siudak, W. Zipper, H. Ohm, C. Adolph, M. Berłowski, B Hoeistad, M. Wolke, Hans Calén, Kjell Fransson, Stanisław Kistryn, H. Yamaoka, Serdyuk, Himani Bhatt, N. Paul, A. Magiera, Jozef Zlomanczuk, B. Kamys, C. Ekström, T. Johansson, D Duniec, B. Kłos, M. Buescher, O. Khakimova, U Bechstedt, D. Prasuhn, N. Shah, H. Clement, K. Grigoryev, T. Skorodko, N.M. Piskunov, T. Tolba, N Milke, R Jany, J. Bisplinghoff, J Majewski, Andrzej Kupsc, T Smolinski, A Winnemoeller, Rafał Czyżykiewicz, T. Sefzick, Wolfgang Scobel, H Machner, Akira Yamamoto, A. Bondar, W Migdal, M. Mikirtychiants, B. Borasoy, O Miklukho, M. Siemaszko, Christoph Hanhart, P Vlasov, P. Podkopał, Wojciech Krzemien, P. Kulessa, W. Erven, L. Jarczyk, L. Yurev, X. Yuan, W Weglorz, R. Maier, Alexander Schmidt, Zbigniew Rudy, W. Eyrich, K. Pysz, W. Schroeder, U.-G. Meissner, M Mittag, I Zychor, K. Zwoll, T. Rausmann, Aleksandra Wrońska, A Nawrot, A. Khoukaz, Eryk Czerwiński, J Rachowski, A Izotov, H. Stroeher, N Kimura, K Nandi, S. Schadmand, A Odoyo, Paweł Moskal, Michał Janusz, Harald Kleines, A Roy, S Belostotski, Marek Jacewicz, K Chandwani, C. Zheng, C. Pauly, G D'Orsaneo, A Heczko, Kyryanchuk, D Spoelgen, K Ulbrich, R Marciniewski, A. Pricking, R Wuestner, K. Kilian, R Salmin, Günter Kemmerling, F. Kren, A. Kuzmin, Damian Tomasz Gil, Sopov, R. Varma, W. Oelert, J Zielinski, I. Keshelashvili, F Redmer, J. Zabierowski, M. Bashkanov, J. Ritman, J. Klaja, M Angelstein, H. S. Xu, Antoni Szczurek, J. Stepaniak, Jerzy Smyrski, A Kowalczyk, A. Povtoreyko, R Nissler, P. Pluciński, Hejny, A. Trzciński, Roger Ruber, Frank Goldenbaum, O Felden, M. Hodana, Y. Petukhov, Andreas Wirzba, G. Sterzenbach, F. Hinterberger, Ralf Engels, A. Teufel, S. Kullander, and P. Fedorets

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Chiral perturbation theory, Proton, Nuclear Theory, Detector, Dalitz plot, Kinetic energy, Nuclear physics, Pion, Distribution (mathematics), Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

In the first production run of the WASA experiment at COSY, the eta decay into three neutral pions was measured in proton-proton interactions at a proton beam kinetic energy of 1.4 GeV. The Dalitz ...

Published
2009

8. ABC effect and resonance structure in the double-pionic fusion toHe3

Author

V. Hejny, Akira Yamamoto, A. Kupść, Frank Goldenbaum, A. Khoukaz, Pawel Marciniewski, K. Lalwani, Jozef Zlomanczuk, A. Kuzmin, J. Ritman, V. Serdyuk, P. Żuprański, Jerzy Smyrski, Bo Höistad, M. Berłowski, B. Kamys, P. Wüstner, G. J. Wagner, P. Adlarson, A. Magiera, Hans Calén, F. S. Bergmann, S. Schadmand, R. Varma, S. Sawant, Magnus Wolke, W. Eyrich, A. Zink, K. Pysz, P. Fedorets, M. Bashkanov, P. Goslawski, Kjell Fransson, I. Ozerianska, Ferdous Khan, N. Hüsken, H. Ohm, G. Sterzenbach, D. Pszczel, T. Skorodko, B. Lorentz, P. Podkopał, H. Clement, A. Pyszniak, W. Augustyniak, Alexander Bondar, T. Sefzick, R. Maier, Di. Kirillov, Zbigniew Rudy, M. Żurek, A. Erven, E. Stephan, Ralf Engels, F. Hauenstein, Paweł Moskal, Eryk Czerwiński, T. Johansson, B. Shwartz, J. Stepaniak, M. Mikirtychiants, Magdalena Skurzok, Aleksandra Wrońska, A. Täschner, B. Mariański, Harald Kleines, B. Kłos, E. Perez del Rio, Izabela Ciepał, A. Goswami, A. Pricking, P. Wurm, D. Lersch, H. Ströher, H. P. Morsch, Wojciech Krzemien, W. Erven, Hans Stockhorst, Stanisław Kistryn, E. Doroshkevich, K. Demmich, C.-O. Gullström, Markus Büscher, Marcin Zieliński, N.M. Piskunov, Rolf Stassen, H. Bhatt, Lena Heijkenskjöld, D. Prasuhn, J. Zabierowski, K. Grigoryev, Antoni Szczurek, L. Jarczyk, Günter Kemmerling, K. Föhl, A. Trzciński, P. Kulessa, L. Yurev, V. Sopov, Ankhi Roy, R. Siudak, W. Bardan, and D. Coderre

Subjects
Mass enhancement, Nuclear physics, Physics, Nuclear and High Energy Physics, Fusion, Near threshold, Angular distribution, Meson production, Dalitz plot, Pi interaction, Nuclear matter
Abstract

Exclusive and kinematically complete measurements of the double pionic fusion to He-3 have been performed in the energy region of the so-called ABC effect, which denotes a pronounced low-mass enhan ...

Published
2015

9. Measurement of theη→π+π−π0Dalitz plot distribution

Author

M. Hodana, C. F. Redmer, Himani Bhatt, E. Stephan, D. Pszczel, G. Sterzenbach, B. Lorentz, B. Mariański, A. Magiera, A.E. Bondar, S. Sawant, A. Zink, F. S. Bergmann, Magnus Wolke, S. Schadmand, P. Goslawski, Akira Yamamoto, B. Shwartz, J. Stepaniak, K. Grigoryev, N.M. Piskunov, Ankhi Roy, Pawel Marciniewski, Di. Kirillov, P. Adlarson, K. Fransson, A. Täschner, H. Clement, P. Podkopał, L. Jarczyk, A. Kuzmin, A. Kupść, J. Ritman, V. Serdyuk, R. Maier, T. Johansson, H. Ohm, L. Yurev, Jerzy Smyrski, B. Kamys, B. Kłos, Ulf-G. Meißner, K. Demmich, R. Engels, H. P. Morsch, Stanisław Kistryn, A. Trzcinski, P. Wüstner, Paweł Moskal, M. Żurek, Aleksandra Wrońska, E. Perez del Rio, X. Yuan, V. Sopov, Benedykt R. Jany, F. Hauenstein, Lena Heijkenskjöld, A. Pricking, Wojciech Krzemien, D. Prasuhn, P. Wurm, Marcin Zieliński, P. Kulessa, M. Mikirtychiants, Magdalena Skurzok, W. Erven, M. Bashkanov, Jozef Zlomanczuk, Izabela Ciepał, Zbigniew Rudy, A. Goswami, K. Lalwani, K. Pysz, Günter Kemmerling, A. Erven, R. Siudak, W. Bardan, Ferdous Khan, Hans Stockhorst, A. Pyszniak, W. Augustyniak, C. Zheng, B. V. Martemyanov, Rolf Stassen, D. Lersch, Eryk Czerwiński, J. Zabierowski, A. Khoukaz, Harald Kleines, Antoni Szczurek, D. Coderre, Bo Höistad, H. Ströher, W. Eyrich, N. Hüsken, V. Hejny, K. Föhl, C.-O. Gullström, Markus Büscher, P. Fedorets, M. Berłowski, T. Skorodko, Hans Calén, Frank Goldenbaum, E. Doroshkevich, A. Jany, P. Żuprański, T. Sefzick, R. Varma, and I. Ozerianska

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Distribution (number theory), Meson, 010308 nuclear & particles physics, 0103 physical sciences, Dalitz plot, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract

The Dalitz plot distribution of the $\ensuremath{\eta}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ decay is determined by using a data sample of $1.2\ifmmode\times\else\texttimes\fi{}{10}^{7}$ $\ensuremath{\eta}$ mesons from the $pd\ensuremath{\rightarrow}^{3}\mathrm{He}\ensuremath{\eta}$ reaction at 1 GeV collected by the WASA detector at COSY.

Published
2014

10. Cross section ratio and angular distributions of the reaction p + d -> 3He + eta at 48.8 MeV and 59.8 MeV excess energy

Author

M. Bashkanov, Benedykt R. Jany, A. Erven, E. Stephan, R. Siudak, W. Bardan, K. Lalwani, D. Lersch, P. Podkopał, H. P. Morsch, C. F. Redmer, A. Zink, R. Maier, G. J. Wagner, A. Magiera, B. Mariański, Jozef Zlomanczuk, S. Sawant, V. Sopov, D. Coderre, Günter Kemmerling, Aleksandra Wrońska, W. Eyrich, E. Perez del Rio, V. Hejny, K. Föhl, Stanisław Kistryn, K. Demmich, P. Goslawski, F. Hauenstein, Lena Heijkenskjöld, D. Prasuhn, A. Trzciński, A. Kupść, L. Yurev, N. Hüsken, P. Wurm, T. Johansson, Himani Bhatt, Annika Passfeld, A. Khoukaz, P. Kulessa, H. Clement, M. Hodana, B. Kłos, A. Pricking, W. Węglorz, E. Doroshkevich, M. Żurek, A. Pyszniak, W. Augustyniak, A. Jany, Ankhi Roy, C.-O. Gullström, Markus Büscher, H. Ohm, N.M. Piskunov, R. Varma, M. Berłowski, Paweł Moskal, W. Erven, P. Fedorets, H. Ströher, Marcin Zieliński, M. Krapp, F. S. Bergmann, I. Ozerianska, J. Stepaniak, Akira Yamamoto, T. Skorodko, Magnus Wolke, K. Fransson, T. Sefzick, Hans Calén, B. Kamys, P. Wüstner, K. Grigoryev, Frank Goldenbaum, K. Pysz, Pawel Marciniewski, Ferdous Khan, J. Ritman, V. Serdyuk, P. Żuprański, Jerzy Smyrski, S. Schadmand, P. Adlarson, M. Mikirtychiants, Magdalena Skurzok, Bo Höistad, Izabela Ciepał, A. Goswami, Zbigniew Rudy, L. Jarczyk, Eryk Czerwiński, G. Sterzenbach, B. Lorentz, Harald Kleines, Hans Stockhorst, Ralf Engels, A. Täschner, Rolf Stassen, Di. Kirillov, D. Pszczel, J. Zabierowski, Antoni Szczurek, and Wojciech Krzemien

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Intermediate Energies, Eta, 01 natural sciences, 7. Clean energy, Nuclear physics, Cross section (physics), Tensor Analyzing Power, Deuterium, Near-Threshold, 0103 physical sciences, Energy interval, Physics::Accelerator Physics, ddc:530, 010306 general physics, Nuclear Experiment, Excess energy, Beam (structure)
Abstract

We present new data for angular distributions and on the cross section ratio of the p + d -> 3He + eta reaction at excess energies of Q = 48.8 MeV and Q = 59.8 MeV. The data have been obtained at the WASA-at-COSY experiment (Forschungszentrum J\"ulich) using a proton beam and a deuterium pellet target. While the shape of obtained angular distributions show only a slow variation with the energy, the new results indicate a distinct and unexpected total cross section fluctuation between Q = 20 MeV and Q = 60 MeV, which might indicate the variation of the production mechanism within this energy interval., Comment: 9 pages, 9 figures

Published
2014

11. Evidence for a New Resonance from Polarized Neutron-Proton Scattering

Author

A. Magiera, M. Buescher, James Ritman, M. Mikirtychiants, Magdalena Skurzok, F. Hauenstein, T. Sefzick, A. Taeschner, H. Stockhorst, L. Yurev, K. Lalwani, J. Stepaniak, Jozef Zlomanczuk, Frank Goldenbaum, G. J. Wagner, A. Khoukaz, Paweł Moskal, Tord Johansson, Wojciech Krzemien, M. Krapp, P. Goslawski, R. Stassen, B. Kamys, P. Zupranski, F. S. Bergmann, A. Zink, M. Hodana, W. Eyrich, K. Foehl, A. Pricking, D. Lersch, K. Pysz, P. Fedorets, Ferdous Khan, H. Stroeher, I. I. Strakovsky, Aleksandra Wrońska, E. Perez del Rio, H. Ohm, N. Huesken, Günter Kemmerling, Izabela Ciepał, A. Goswami, M. Bashkanov, P. Wurm, Di. Kirillov, R. Varma, H. P. Morsch, C. F. Redmer, K. Grigoryev, A. Erven, E. Doroshkevich, M. Wolke, Hans Calén, I. Ozerianska, J. Zabierowski, A. Pyszniak, W. Augustyniak, Bo Höistad, A. Jany, Antoni Szczurek, W. J. Briscoe, D. Pszczel, Kjell Fransson, P. Podkopał, Andrzej Kupsc, Akira Yamamoto, A. Trzciński, Said Data Anal Ctr, M. Berłowski, S. Schadmand, R. Maier, L. Jarczyk, Stanisław Kistryn, B. Lorentz, P. Wuestner, V. Hejny, Anubhab Roy, Lena Heijkenskjöld, T. Skorodko, E. Stephan, V. Sopov, P. Adlarson, K. Demmich, Zbigniew Rudy, Pawel Marciniewski, R. Siudak, Eryk Czerwiński, Harald Kleines, V. Serdyuk, Jerzy Smyrski, B. Kłos, G. Sterzenbach, Ralf Engels, Ron L. Workman, S. Sawant, W. Erven, Marcin Zieliński, B. Mariański, P. Kulessa, H. Clement, C.-O. Gullström, N.M. Piskunov, H. Bhatt, Benedykt R. Jany, Maria Zurek, W. Bardan, D. Prasuhn, and D. Coderre

Subjects
Physics, Elastic scattering, States, Scattering, Partial wave analysis, Dibaryon, Nuclear Theory, FOS: Physical sciences, General Physics and Astronomy, Hexaquark, Analyzing Power, Resonance (particle physics), Nuclear physics, Angular distribution, Elastic-Scattering, Proton scattering, ddc:550, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, Partial-Wave Analysis, Spin Observables
Abstract

Exclusive and kinematically complete high-statistics measurements of quasifree polarized (n) over right arrowp scattering have been performed in the energy region of the narrow resonancelike structure d* with I(J(P)) = 0(3(+)),M approximate to 2380 MeV, and Gamma approximate to 70 MeV observed recently in the double-pionic fusion channels pn -> d pi(0)pi(0) and pn -> d pi(+)pi(-). The experiment was carried out with the WASA detector setup at COSY having a polarized deuteron beam impinged on the hydrogen pellet target and utilizing the quasifree process (d) over right arrowp -> np + p(spectator). This allowed the np analyzing power, A(y), to be measured over a broad angular range. The obtained A(y) angular distributions deviate systematically from the current SAID SP07 NN partial-wave solution. Incorporating the new A(y) data into the SAID analysis produces a pole in the D-3(3) - (3)G(3) waves in support of the d* resonance hypothesis.

Published
2014

12. Search forη-mesic4He with the WASA-at-COSY detector

Author

B. Kamys, Stanisław Kistryn, A. Goswami, Paweł Moskal, W. Zipper, D. Coderre, P. Wüstner, T. Tolba, W. Bardan, M. Bashkanov, Zbigniew Rudy, A. Kupść, Lena Heijkenskjöld, Hans Stockhorst, Rolf Stassen, A. Magiera, V. Serdyuk, D. Prasuhn, V. Hejny, T. Johansson, P. Kulessa, Eryk Czerwiński, T. Sefzick, D. Pszczel, Akira Yamamoto, Szymon Niedźwiecki, B. Kłos, K. Föhl, Harald Kleines, P. Vlasov, P. Goslawski, James Ritman, F. Hinterberger, A. Roy, R. Siudak, K. Pysz, H. Ströher, K. Lalwani, Jozef Zlomanczuk, Ferdous Khan, L. Yurev, R. Engels, Pawel Marciniewski, Frank Goldenbaum, H. Clement, K. Demmich, M. Krapp, S. Schadmand, Bo Höistad, Basanta Kumar Nandi, M. Żurek, C.-O. Gullström, Markus Büscher, P. Adlarson, G. J. Wagner, W. Węglorz, A. Pyszniak, W. Augustyniak, F. S. Bergmann, Magnus Wolke, F. Hauenstein, R. Varma, H. Bhatt, H. Ohm, Jerzy Smyrski, N. Shah, M. Hodana, W. Eyrich, B. Mariański, A. Pricking, P. Fedorets, P. Żuprański, J. Stepaniak, I. Ozerianska, M. Siemaszko, Benedykt R. Jany, J. Zabierowski, X. Yuan, D. Lersch, P. Pluciński, Alexander Schmidt, J. Klaja, Hans Calén, Antoni Szczurek, M. Mikirtychiants, Magdalena Skurzok, W. Erven, C. Zheng, Aleksandra Wrońska, E. Perez del Rio, V. Sopov, H. P. Morsch, C. F. Redmer, L. Li, P. Wurm, Wojciech Krzemien, Kjell Fransson, Marcin Zieliński, P. Podkopał, R. Maier, E. Doroshkevich, K. Grigoryev, L. Jarczyk, A. Jany, E. Stephan, M. Berłowski, T. Skorodko, A. Khoukaz, G. Sterzenbach, B. Lorentz, S. Sawant, Günter Kemmerling, A. Trzciński, and Tomasz Bednarski

Subjects
Excitation function, Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Detector, 01 natural sciences, Synchrotron, law.invention, Nuclear physics, law, 0103 physical sciences, Bound state, 010306 general physics
Abstract

An exclusive measurement of the excitation function for the dd -> (3)Hep pi(-) reaction was performed at the Cooler Synchrotron COSY-Julich with the WASA-at-COSY detection system. The data were ...

Published
2013

13. Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect

Author

P. Wüstner, M. Mikirtychiants, Magdalena Skurzok, H. Ströher, K. Grigoryev, Pawel Marciniewski, Tord Johansson, V. Serdyuk, Jerzy Smyrski, A. Magiera, S. Sawant, H. Stockhorst, Frank Goldenbaum, M. Żurek, G. Sterzenbach, L. Jarczyk, C.-O. Gullström, James Ritman, Markus Büscher, M. Krapp, A. Pricking, W. Erven, B. Mariański, P. Adlarson, T. Skorodko, G. J. Wagner, A. Khoukaz, Alexander Schmidt, H. P. Morsch, X. Yuan, D. Lersch, H. Ohm, F. S. Bergmann, W. Eyrich, P. Goslawski, Magnus Wolke, R. Stassen, E. Doroshkevich, Günter Kemmerling, T. Tolba, P. Żuprański, Wojciech Krzemien, C. Zheng, A. Trzciński, A. Jany, Jozef Zlomanczuk, F. Hauenstein, K. Föhl, C. F. Redmer, Tomasz Bednarski, L. Yurev, V. Hejny, J. Stepaniak, P. Pluciński, Marcin Zieliński, K. Demmich, P. Podkopał, Lena Heijkenskjöld, M. Hodana, T. Sefzick, W. Węglorz, A. Pyszniak, W. Augustyniak, Hans Calén, K. Pysz, P. Fedorets, D. Pszczel, R. Maier, Ferdous Khan, B. Kłos, H. Bhatt, B. Lorentz, Kjell Fransson, Aleksandra Wrońska, E. Perez del Rio, L. Li, A. Goswami, F. Hinterberger, P. Wurm, M. Berłowski, P. Kulessa, Paweł Moskal, E. Stephan, S. Schadmand, Akira Yamamoto, A. Kupść, M. Bashkanov, N. Shah, K. Lalwani, R. Varma, I. Ozerianska, Benedykt R. Jany, H. Clement, Basanta Kumar Nandi, Bo Höistad, Zbigniew Rudy, R. Siudak, J. Klaja, Eryk Czerwiński, Szymon Niedźwiecki, Harald Kleines, P. Vlasov, W. Zipper, W. Bardan, D. Coderre, V. Sopov, R. Engels, D. Prasuhn, Ankhi Roy, St. Kistryn, M. Siemaszko, J. Zabierowski, Antoni Szczurek, and B. Kamys

Subjects
Nuclear reaction, Nuclear and High Energy Physics, Particle physics, fusion, +deuteron+2pi%22">p nucleon --> deuteron 2pi, Meson, Gev-C, two-pion [mass spectrum], Nuclear Theory, Hadron, isovector, FOS: Physical sciences, Elementary particle, Juelich COSY PS, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, ABC effect and resonance structure, isoscalar, 0103 physical sciences, Pi, Nuclear fusion, Collisions, ddc:530, Meson Production, Nuclear Experiment (nucl-ex), WASA, Nuclear Experiment, 010306 general physics, Physics, 010308 nuclear & particles physics, Double Pion Production, mass enhancement, Pp, energy dependence [channel cross section], Total Cross-Sections, isospin decomposition, p n, Abc Effect And Resonance Structure, double pion production, Isospin, fusion [p p], pair production [pi], Lsospin Decomposition, experimental results
Abstract

Exclusive and kinematically complete high-statistics measurements of the basic double-pionic fusion reactions $pn\rightarrow d\pi ^{0}\pi ^{0}, pn\rightarrow d\pi ^{+}\pi ^{-}$ and $pp\rightarrow d\pi ^{+}\pi ^{0}$ have been carried out simultaneously over the energy region of the ABC effect using the WASA detector setup at COSY. Whereas the isoscalar reaction part given by the $d\pi ^{0}\pi ^{0}$ channel exhibits the ABC effect, i.e. a low-mass enhancement in the $\pi \pi$ - invariant mass distribution, as well as the associated resonance structure in the total cross section, the isovector part given by the $d\pi ^{+}\pi ^{-}$ channel shows a smooth behavior consistent with the conventional t -channel $\Delta \Delta$ process. The $d\pi^{+}\pi ^{-}$ data are very well reproduced by combining the data for isovector and isoscalar contributions, if the kinematical consequences of the isospin violation due to different masses for charged and neutral pions are taken into account.

Published
2013

14. Abashian-Booth-Crowe resonance structure in the double pionic fusion to He-4

Author

R. Varma, I. Ozerianska, T. Tolba, A. Magiera, S. Schadmand, B. Mariański, P. Wuestner, K. Lalwani, B. Kamys, D. Pszczel, Hans Stockhorst, D. Lersch, Zbigniew Rudy, Rolf Stassen, Jozef Zlomanczuk, M. Berłowski, Patrik Adlarson, Benedykt R. Jany, B. Kłos, M. Buescher, C. Pauly, F. Hinterberger, T. Skorodko, F. S. Bergmann, Magnus Wolke, Eryk Czerwiński, G. Kemmerling, Frank Goldenbaum, P. Goslawski, Ankhi Roy, Stanisław Kistryn, R. Siudak, H. Ohm, W. Zipper, W. Bardan, Paweł Moskal, A. Trzciński, K. Foehl, H. Kleines, P. Vlasov, S. Sawant, Tomasz Bednarski, P. Podkopał, Lena Heijkenskjöld, J. Klaja, P. Zupranski, A. Pricking, N. Shah, D. Prasuhn, M. Bashkanov, H. Clement, Basanta Kumar Nandi, Alexander Schmidt, Wojciech Krzemien, G. Sterzenbach, B. Lorentz, E. Doroshkevich, X. Yuan, Pawel Plucinski, R. Maier, A. Jany, P. Kulessa, Marcin Zieliński, Bo Höistad, G. J. Wagner, C. Zheng, Y. Petukhov, K. Demmich, R. Engels, C. F. Redmer, A. Khoukaz, L. Yurev, W. Węglorz, K. T Brinkmann, W. Augustyniak, W. Eyrich, K. Grigoryev, J. Zabierowski, W. Erven, V. Sopov, Andrzej Kupsc, Antoni Szczurek, D. Coderre, M. Hodana, V. Hejny, Akira Yamamoto, L. Jarczyk, Carl-Oscar Gullström, M. Mikirtychiants, Magdalena Skurzok, Tord Johansson, Aleksandra Wrońska, E. Perez del Rio, Szymon Niedzwiecki, P. Wurm, Pawel Marciniewski, J. Ritman, V. Serdyuk, Jerzy Smyrski, Andzej Pyszniak, Hans Calén, Kjell Fransson, H. Stroeher, C. Husmann, L. Li, H. P. Morsch, H. Bhatt, K. Pysz, P. Fedorets, Ferdous Khan, F. Hauenstein, and J. Stepaniak

Subjects
Nuclear and High Energy Physics, Particle physics, Meson production, two-pion [mass spectrum], pair production [pi0], Juelich COSY PS, 0.4-0.7 GeV/nucleon, +helium+2pi0%22">deuteron deuteron --> helium 2pi0, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear fusion, ddc:530, Collisions, Meson Production, WASA, Nuclear Experiment, 010306 general physics, Inclusive Reaction, Nuclear-Matter, Physics, Range (particle radiation), Fusion, fusion [deuteron deuteron], 010308 nuclear & particles physics, Dibaryons, energy dependence [channel cross section], Nuclear matter, width [resonance], angular dependence [differential cross section], Abc Enhancement, experimental results
Abstract

Exclusive and kinematically complete high-statistics measurements of the double pionic fusion reaction dd -> He-4 pi(0)pi(0) have been performed in the energy range 0.8-1.4 GeV covering thus the region of the Abashian-Booth-Crowe effect, which denotes a pronounced low-mass enhancement in the pi pi invariant mass spectrum. The experiments were carried out with the WASA detector setup at the cooler synchrotron at Forshungszentrum Julich GmbH. Similar to the observation in the basic pn -> d pi(0)pi(0) reaction, the data reveal a correlation between the ABC effect and a resonancelike energy dependence in the total cross section. The maximum occurs at m = 2.37 GeV + 2m(N), i.e., at the same position as in the basic reaction. The observed resonance width Gamma approximate to 160 MeV can be understood from broadening due to Fermi motion of the nucleons in initial and final nuclei together with collision damping. Differential cross sections are described equally well by the hypothesis of a pn resonance formation during the reaction process.

Published
2012
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15. Abashian-Booth-Crowe Effect in Basic Double-Pionic Fusion: A New Resonance?

Author

Zbigniew Rudy, N. Shah, B. Lorentz, Alexander Schmidt, W. Schroeder, Ankhi Roy, P. Podkopał, A. Povtoreyko, Eryk Czerwiński, H. Stroeher, R. Maier, Roger Ruber, Harald Kleines, P. Vlasov, M. Wolke, V. Sopov, M. Bashkanov, Aleksandra Wrońska, M. Siemaszko, E. Perez del Rio, F. Kren, G. Sterzenbach, Hans Calén, P. Wurm, J. Stepaniak, K. Grigoryev, M. Hodana, D. Coderre, P. Goslawski, Andrzej Kupsc, H. P. Morsch, Kjell Fransson, H. Clement, H. Ohm, L. Jarczyk, Y. Petukhov, C. Adolph, X. Yuan, Jozef Zlomanczuk, W. Erven, O. Khakimova, G. J. Wagner, A. Taeschner, K. Lalwani, Annika Passfeld, Marek Jacewicz, J. Hampe, B. Mariański, P. Wuestner, Vadim Baru, A. Khoukaz, C. Zheng, K.-T. Brinkmann, Wojciech Krzemien, Frank Goldenbaum, C. F. Redmer, J. Klaja, Sven Kullander, P. Zupranski, A. Magiera, K. Pysz, Pawel Plucinski, W. Eyrich, T. Rausmann, James Ritman, B. Kłos, A. Pricking, Patrik Adlarson, P. Kulessa, Szymon Niedzwiecki, B. Kamys, M. Mikirtychiants, Andreas Wirzba, Bo Höistad, Magdalena Skurzok, Marcin Zieliński, S. Sawant, Günter Kemmerling, R. Siudak, W. Zipper, A. Trzciński, R. Engels, D. Prasuhn, Tomasz Bednarski, Tord Johansson, Michał Janusz, F. S. Bergmann, Hans Stockhorst, Rolf Stassen, C. Pauly, F. Hinterberger, W. Węglorz, W. Augustyniak, Carl-Oscar Gullström, J. Zabierowski, Antoni Szczurek, Christoph Hanhart, V. Serdyuk, Jerzy Smyrski, Stanisław Kistryn, C. Ekström, Pavel Marciniewski, Lena Heijkenskjöld, Paweł Moskal, V. Hejny, P. Fedorets, E. Doroshkevich, A. Jany, M. Berłowski, R. Varma, M. Buescher, T. Skorodko, T. Sefzick, A. Winnemoeller, S. Schadmand, K. Foehl, T. Tolba, L. Yurev, Benedykt R. Jany, Himani Bhatt, Basanta Kumar Nandi, N.M. Piskunov, and V. Grishina

Subjects
Nuclear physics, Physics, Particle physics, Fusion, ddc:550, General Physics and Astronomy, Nuclear fusion, Fusion power, Nuclear Experiment, Resonance (particle physics)
Abstract

We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn -> d pi(0)pi(0) over the full energy region of the ABC effect, a pronounced low-mass enhancement in the pi pi-invariant mass spectrum. The measurements, which cover also the transition region to the conventional t- channel Delta Delta process, were performed with the upgraded WASA detector setup at COSY. The data reveal the Abashian-Booth-Crowe effect to be uniquely correlated with a Lorentzian energy dependence in the integral cross section. The observables are consistent with a narrow resonance with m = 2.37 GeV, Gamma approximate to 70 MeV and I(J(P)) = 0(3(+)) in both pn and Delta Delta systems. Necessary further tests of the resonance interpretation are discussed.

Published
2011

16. Studies of the $\eta$ meson decays with WASA

Author

Michał Janusz, N. Shah, P. Adlarson, M. Berłowski, Jozef Zlomanczuk, P. Vlasov, L. Yurev, K. Chandwani, Himani Bhatt, Andrzej Kupsc, Ch. F. Redmer, C. Pauly, J. Stepaniak, M. Hodanade, A. Winnemoller, and D. Coderre

Subjects
Physics, Particle physics, Eta meson
Published
2009

17. Abashian-Booth-Crowe effect in basic double-pionic fusion: a new resonance?

Author

Adlarson P, Adolph C, Augustyniak W, Baru V, Bashkanov M, Bednarski T, Bergmann FS, Berłowski M, Bhatt H, Brinkmann KT, Büscher M, Calén H, Clement H, Coderre D, Czerwiński E, Doroshkevich E, Ekström C, Engels R, Erven W, Eyrich W, Fedorets P, Föhl K, Fransson K, Goldenbaum F, Goslawski P, Grigoryev K, Grishina V, Gullström CO, Hampe J, Hanhart C, Heijkenskjöld L, Hejny V, Hinterberger F, Hodana M, Höistad B, Jacewicz M, Janusz M, Jany A, Jany BR, Jarczyk L, Johansson T, Kamys B, Kemmerling G, Khakimova O, Khoukaz A, Kistryn S, Klaja J, Kleines H, Kłos B, Kren F, Krzemień W, Kulessa P, Kullander S, Kupść A, Lalwani K, Lorentz B, Magiera A, Maier R, Marciniewski P, Mariański B, Mikirtychiants M, Moskal P, Morsch HP, Nandi BK, Niedźwiecki S, Ohm H, Passfeld A, Pauly C, del Rio EP, Petukhov Y, Piskunov N, Pluciński P, Podkopał P, Povtoreyko A, Prasuhn D, Pricking A, Pysz K, Rausmann T, Redmer CF, Ritman J, Roy A, Ruber RJ, Rudy Z, Sawant S, Schadmand S, Schmidt A, Schroeder W, Sefzick T, Serdyuk V, Shah N, Siemaszko M, Siudak R, Skorodko T, Skurzok M, Smyrski J, Sopov V, Stassen R, Stepaniak J, Sterzenbach G, Stockhorst H, Ströher H, Szczurek A, Täschner A, Tolba T, Trzciński A, Varma R, Vlasov P, Wagner GJ, Węglorz W, Winnemöller A, Wirzba A, Wolke M, Wrońska A, Wüstner P, Wurm P, Yuan X, Yurev L, Zabierowski J, Zheng C, Zieliński MJ, Zipper W, Złomańczuk J, and Zuprański P

Abstract

We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn→dπ(0)π(0) over the full energy region of the ABC effect, a pronounced low-mass enhancement in the ππ-invariant mass spectrum. The measurements, which cover also the transition region to the conventional t-channel ΔΔ process, were performed with the upgraded WASA detector setup at COSY. The data reveal the Abashian-Booth-Crowe effect to be uniquely correlated with a Lorentzian energy dependence in the integral cross section. The observables are consistent with a narrow resonance with m=2.37  GeV, Γ≈70  MeV and I(J(P))=0(3(+)) in both pn and ΔΔ systems. Necessary further tests of the resonance interpretation are discussed.

Published
2011
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