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13 results on '"J. Klaja"'

1. Search for a dark photon in the π0→e+e−γ decay

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Muon, Anomalous magnetic dipole moment, Magnetic moment, 010308 nuclear & particles physics, Elementary particle, 01 natural sciences, 7. Clean energy, Dark photon, Nuclear physics, Massless particle, Particle decay, 0103 physical sciences, 010306 general physics, Lepton
Abstract

The presently world largest data sample for π 0 → γ e + e − decays studies containing nearly 5 × 10 5 events was collected using the WASA detector at COSY. A search for a dark photon U produced in the π 0 → γ U → γ e + e − decay from the p p → p p π 0 reaction was carried out. An upper limit on the square of the U − γ mixing strength parameter ϵ 2 of 5 × 10 − 6 at 90% CL was obtained for the mass range 20 MeV M U 100 MeV . This result together with other recent experimental limits significantly reduces the M U vs. ϵ 2 parameter space which could explain the presently seen deviation between the Standard Model prediction and the direct measurement of the anomalous magnetic moment of the muon.

Published
2013

2. 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

3. Invariant-mass distributions for the pp $ \rightarrow$ pp$ \eta$ reaction at Q = 10 MeV

Author

B. Kamys, Wojciech Krzemien, P. Wüstner, W. Zipper, L. Jarczyk, Rafał Czyżykiewicz, A. Khoukaz, M. Siemaszko, J. Ritman, Paweł Moskal, Damian Tomasz Gil, Jerzy Smyrski, W. Oelert, D. Grzonka, Marcin Zieliński, Magnus Wolke, Paweł Klaja, Michał Silarski, A. Täschner, J. Klaja, Jarosław Zdebik, T. Sefzick, and Eryk Czerwiński

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, Detector, excess energy, nucleon resonance, Spectral line, Synchrotron, law.invention, Nuclear physics, Cross section (physics), invariant mass, excitation function, law, drift chamber, Physics::Accelerator Physics, Invariant mass, Nuclear Experiment, Excess energy
Abstract

Proton-proton and proton-eta invariant mass distributions and the total cross section for the pp to pp eta reaction have been determined near the threshold at an excess energy of Q=10 MeV. The experiment has been conducted using the COSY-11 detector setup and the cooler synchrotron COSY. The determined invariant mass spectra reveal significant enhancements in the region of low proton-proton relative momenta, similarly as observed previously at higher excess energies of Q=15.5 MeV and Q= 40MeV.

Published
2009

4. 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

5. Measurement of thepn→ppπ0π−reaction in search for the recently observed resonance structure indπ0π0anddπ+π−systems

Author

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

Subjects
Nuclear physics, Mass enhancement, Physics, Nuclear and High Energy Physics, Roper resonance, Meson production, Pi, Analytical chemistry
Abstract

Exclusive measurements of the quasifree pn -> pp pi(0)pi(-) reaction have been performed by means of pd collisions at T-p = 1.2 GeV using the wide angle shower apparatus (WASA) detector setup at ...

Published
2013

6. Investigation of thedd→3Henπ0reaction with the FZ Jülich WASA-at-COSY facility

Author

P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, F. S. Bergmann, M. Berłowski, H. Bhatt, M. Büscher, H. Calén, I. Ciepał, H. Clement, D. Coderre, E. Czerwiński, K. Demmich, E. Doroshkevich, R. Engels, 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, F. Hinterberger, M. Hodana, B. Höistad, A. Jany, B. R. Jany, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, F. A. Khan, A. Khoukaz, D. A. Kirillov, S. Kistryn, J. Klaja, H. Kleines, B. Kłos, M. Krapp, W. Krzemień, P. Kulessa, A. Kupść, K. Lalwani, D. Lersch, L. Li, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Mariański, M. Mikirtychiants, H.-P. Morsch, P. Moskal, B. K. Nandi, H. Ohm, I. Ozerianska, E. Perez del Rio, N. M. Piskunov, P. Pluciński, P. Podkopał, D. Prasuhn, A. Pricking, D. Pszczel, K. Pysz, A. Pyszniak, C. F. Redmer, J. Ritman, A. Roy, Z. Rudy, S. Sawant, A. Schmidt, S. Schadmand, T. Sefzick, V. Serdyuk, N. Shah, M. Siemaszko, R. Siudak, T. Skorodko, M. Skurzok, J. Smyrski, V. Sopov, R. Stassen, J. Stepaniak, E. Stephan, G. Sterzenbach, H. Stockhorst, H. Ströher, A. Szczurek, T. Tolba, A. Trzciński, R. Varma, G. J. Wagner, W. Węglorz, M. Wolke, A. Wrońska, P. Wüstner, P. Wurm, A. Yamamoto, X. Yuan, J. Zabierowski, C. Zheng, M. J. Zieliński, W. Zipper, J. Złomańczuk, P. Żuprański, and M. Żurek

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Sigma, State (functional analysis), 01 natural sciences, Nuclear physics, Momentum, Cross section (physics), Norm (mathematics), Phase space, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

An exclusive measurement of the dd -> 3He n \pi 0 reaction was carried at a beam momentum of p = 1.2 GeV/c using the WASA-at-COSY facility. For the first time data on the total cross section as well as differential distributions were obtained. The data are described with a phenomenological approach based on a combination of a quasi-free model and a partial wave expansion for three-body reaction. The total cross section is found to be \sigma(tot) = (2.89 +- 0.01(stat) +- 0.06(sys) +- 0.29(norm)) \mu b. The contribution of the quasi-free processes (with the neutron being target or beam spectator) accounts for 38% of the total cross section and dominates the differential distributions in specific regions of the phase space. The remaining part of the cross section can be described within a partial wave decomposition indicating the significance of p-wave contributions in the final state.

Published
2013

7. 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

8. 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

9. 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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10. 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

11. Studies of properties of the eta' meson at the COSY-11 facility

Author

E. Czerwiński, P. Klaja, J. Klaja, and Paweł Moskal

Subjects
Physics, Nuclear and High Energy Physics, Mass distribution, Meson, Nuclear Theory, Near threshold eta ' meson production, FOS: Physical sciences, Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Nuclear physics, Cross section (physics), Isospin, Invariant mass, High Energy Physics::Experiment, ddc:530, Nuclear Experiment (nucl-ex), Nuclear Experiment, total width
Abstract

We shortly discuss results on the isospin dependence of the eta-prime production cross section in nucleon-nucleon collisions, results of comparative analysis of the invariant mass distributions for the pp-->pp eta-prime and pp-->pp eta reactions, and we present the value of the total width of the eta-prime meson as derived directly from the mass distribution measured with the mass resolution of 0.3~MeV/c^2., 2 pages, presented at 11th International Workshop On Meson Production, Properties And Interaction (MESON 2010) 10-15 Jun 2010, Cracow, Poland

Published
2011

12. Determination of the total width of the eta' meson

Author

W. Oelert, B. Kamys, P. Wüstner, T. Sefzick, Michał Silarski, Jarosław Zdebik, Paweł Klaja, Paweł Moskal, A. Täschner, D. Grzonka, Marcin Zieliński, Damian Tomasz Gil, J. Ritman, A. Khoukaz, Jerzy Smyrski, J. Klaja, Eryk Czerwiński, M. Siemaszko, W. Zipper, Rafał Czyżykiewicz, Wojciech Krzemien, and Magnus Wolke

Subjects
Physics, Particle physics, Proton, Meson, Mass distribution, 010308 nuclear & particles physics, Hadron, Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, Elementary particle, 01 natural sciences, Particle identification, Gluon, Nuclear physics, Full width at half maximum, 0103 physical sciences, ddc:550, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

Taking advantage of both the low-emittance proton-beam of the Cooler Synchrotron COSY and the high momentum precision of the COSY-11 detector system, the mass distribution of the eta' meson was measured with a resolution of 0.33 MeV/c^2 (FWHM), improving the experimental mass resolution by almost an order of magnitude with respect to previous results. Based on the sample of more than 2300 reconstructed pp --> pp eta' events the total width of the eta' meson was determined to be 0.226 +- 0.017(stat.) +- 0.014(syst.) MeV/c^2., 4 pages, 4 figures

Published
2010

13. Measurement of the invariant mass distributions for the reaction at excess energy of

Author

W. Zipper, Rafał Czyżykiewicz, D. Grzonka, Marcin Zieliński, Eryk Czerwiński, Paweł Klaja, M. Wolke, M. Siemaszko, Jarosław Zdebik, J. Ritman, T. Sefzick, Kanzo Nakayama, Jerzy Smyrski, Paweł Moskal, A. Deloff, B. Kamys, W. Oelert, A. Khoukaz, Michał Silarski, L. Jarczyk, A. Täschner, J. Klaja, and Damian Tomasz Gil

Subjects
Physics, Nuclear and High Energy Physics, Proton, Meson, 010308 nuclear & particles physics, Nuclear Theory, Detector, 01 natural sciences, 7. Clean energy, Synchrotron, law.invention, Nuclear physics, law, 0103 physical sciences, Physics::Accelerator Physics, Invariant mass, Nuclear Experiment, 010306 general physics, Excess energy, Beam (structure)
Abstract

The proton–proton and proton–η′η′ invariant mass distributions have been determined for the pp→ppη′pp→ppη′ reaction at an excess energy of Q=16.4 MeVQ=16.4 MeV. The measurement was carried out using the COSY-11 detector setup and the proton beam of the cooler synchrotron COSY. The shapes of the determined invariant mass distributions are similar to those of the pp→ppηpp→ppη reaction and reveal an enhancement for large relative proton–proton momenta. This result, together with the fact that the proton–η interaction is much stronger that the proton–η′η′ interaction, excludes the hypothesis that the observed enhancement is caused by the interaction between the proton and the meson.

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