Search

Your search keyword '"V. Sopov"' showing total 23 results
Start Over Author "V. Sopov" Topic nuclear theory
23 results on '"V. Sopov"'

1. Search for η mesic 3He with the WASA-at-COSY facility in the pd→3He2γ and pd→3He6γ reactions

Author

P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, S.D. Bass, M. Berłowski, A. Bondar, M. Büscher, H. Calén, I. Ciepał, H. Clement, E. Czerwiński, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Föhl, K. Fransson, F. Goldenbaum, A. Goswami, K. Grigoryev, L. Heijkenskjöld, V. Hejny, S. Hirenzaki, L. Jarczyk, T. Johansson, B. Kamys, N.G. Kelkar, G. Kemmerling, A. Khreptak, D.A. Kirillov, S. Kistryn, H. Kleines, B. Kłos, W. Krzemień, P. Kulessa, A. Kupść, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Mariański, H.-P. Morsch, P. Moskal, H. Ohm, W. Parol, E. Perez del Rio, N.M. Piskunov, D. Prasuhn, D. Pszczel, K. Pysz, J. Ritman, A. Roy, O. Rundel, S. Sawant, S. Schadmand, I. Schätti–Ozerianska, T. Sefzick, V. Serdyuk, B. Shwartz, T. Skorodko, M. Skurzok, J. Smyrski, V. Sopov, R. Stassen, J. Stepaniak, E. Stephan, G. Sterzenbach, H. Stockhorst, H. Ströher, A. Szczurek, A. Trzciński, M. Wolke, A. Wrońska, P. Wüstner, A. Yamamoto, J. Zabierowski, M.J. Zieliński, J. Złomańczuk, P. Żuprański, and M. Żurek

Subjects
Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, lcsh:Physics, lcsh:QC1-999
Abstract

We report on the experimental search for the bound state of an η meson and He3 nucleus performed using the WASA-at-COSY detector setup. In order to search for the η-mesic nucleus decay, the pd→3He2γ and pd→3He6γ channels have been analysed. These reactions manifest the direct decay of the η meson bound in a He3 nucleus. This non-mesonic decay channel has been considered for the first time. When taking into account only statistical errors, the obtained excitation functions reveal a slight indication for a possible bound state signal corresponding to a 3He-η nucleus width Γ above 20 MeV and binding energy Bs between 0 and 15 MeV. However, the determined cross sections are consistent with zero in the range of the systematic uncertainty. Therefore, as final result we estimate only the upper limit for the cross section of the η-mesic He3 nucleus formation followed by the η meson decay which varies between 2 nb and 15 nb depending on possible bound state parameters. Keywords: η-mesic nuclei, η meson

Published
2020

2. Three-nucleon dynamics in dp breakup collisions using the WASA detector at COSY-Jülich

Author

Jozef Zlomanczuk, P. Kulessa, K. Pysz, A. Kupść, Ankhi Roy, J. Zabierowski, A. Trzcinski, Antoni Szczurek, B. Kłos, Aleksandra Wrońska, E. Perez del Rio, A. Deltuva, T. Sefzick, R. Maier, D. Lersch, W. Augustyniak, D. Pszczel, Frank Goldenbaum, S. Schadmand, Eryk Czerwiński, K. Lalwani, S. Sawant, H. P. Morsch, M. Żurek, Harald Kleines, W. Erven, A. Kozela, Jacek Golak, Oleksandr Rundel, Wojciech Krzemien, B. Kamys, P. Żuprański, R. Skibiński, Marcin Zieliński, R. Engels, P. Wüstner, B. Shwartz, J. Stepaniak, Paweł Moskal, W. Eyrich, E. Stephan, A. Magiera, F. S. Bergmann, A. Wilczek, Magnus Wolke, N. Hüsken, V. Sopov, W. Bardan, B. Mariański, M. Berłowski, Patrik Adlarson, Magdalena Skurzok, Hans Calén, Akira Yamamoto, M. Bashkanov, T. Skorodko, Pawel Marciniewski, A. Erven, H. Ströher, K. Fransson, K. Demmich, J. Ritman, Tord Johansson, Henryk Witała, V. Serdyuk, Jerzy Smyrski, K. Grigoryev, L. Jarczyk, A. Khoukaz, Izabela Ciepał, A. Goswami, Hans Stockhorst, Rolf Stassen, G. Sterzenbach, B. Lorentz, Stanisław Kistryn, Lena Heijkenskjöld, D. Prasuhn, V. Hejny, K. Föhl, Günter Kemmerling, Markus Büscher, I. Skwira-Chalot, P. Fedorets, Wiktor Parol, N.M. Piskunov, H. Clement, Di. Kirillov, A.E. Bondar, and Aleksander Khreptak

Subjects
Physics, Scattering cross-section, дейтроны, нуклоны, 010308 nuclear & particles physics, Dynamics (mechanics), Detector, Nuclear Theory, Breakup, 01 natural sciences, dp-развал, Nuclear physics, Deuterium, 0103 physical sciences, Physics::Accelerator Physics, ddc:530, протоны, 010306 general physics, Nucleon, Nuclear Experiment, Beam energy
Abstract

The differential cross section for the 1H(d,pp)n breakup reaction at deuteron beam energy of 340 MeV has been measured with the use of the WASA detector at COSY-Jülich. The set of proton-proton coincidences registered at the Forward Detector has been analyzed on a dense grid of kinematic variables, giving in total around 5600 data points. The cross-section data are compared to theoretical predictions based on the state-of-the-art nucleon-nucleon potentials, combined with a three-nucleon force or the Coulomb interaction or carried out in a relativistic regime.

Published
2020

3. Search for an isospin I= 3 dibaryon

Author

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

Subjects
Nuclear and High Energy Physics, Particle physics, Pion-Production, Gev/C, Nuclear Theory, Hadron, FOS: Physical sciences, 01 natural sciences, Pp Collisions, High Energy Physics - Experiment, Subatomär fysik, Nuclear physics, High Energy Physics - Experiment (hep-ex), dibaryons, Subatomic Physics, 0103 physical sciences, ddc:530, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Proton-Proton Interactions, Physics, Quantum chromodynamics, States, Decomposition, Four-pion production, Dibaryons, 010308 nuclear & particles physics, Resonance, Quantum number, lcsh:QC1-999, Energies, Delta, Resonances, Isospin, four-pion production, 24 Gev-C, Beam energy, lcsh:Physics
Abstract

Various theoretical calculations based on QCD or hadronic interactions predict that in addition to the recently observed dibaryon resonance d⁎(2380) with I(JP)=0(3+) there should also exist a dibaryon resonance with mirrored quantum numbers I(JP)=3(0+). We report here on a search for such a NN-decoupled state in data on the pp→ppπ+π+π−π− reaction. Since no clear-cut evidence has been found, we give upper limits for the production cross section of such a resonance in the mass range 2280–2500 MeV., This work has been supported by DFG (CL 214/3-1), STFC (ST/L00478X/1) and by the Polish National Science Center through grants Nos. DEC-2013/11/N/ST2/04152 and 2011/03/B/ST2/01847

Published
2016

4. Search for η mesic 3He with the WASA-at-COSY facility in the pd→3He2γ and pd→3He6γ reactions

Author

Jozef Zlomanczuk, A. Trzcinski, W. Bardan, A. Magiera, V. Hejny, R. Maier, S. Sawant, James Ritman, Aleksandra Wrońska, E. Perez del Rio, B. Kamys, K. Grigoryev, Izabela Ciepał, D. Pszczel, B. Mariański, P. Wüstner, B.A. Shwartz, A.E. Bondar, T. Sefzick, Akira Yamamoto, A. Kupść, Hans Stockhorst, I. Schätti–Ozerianska, V. Sopov, D. Lersch, Rolf Stassen, T. Johansson, L. Jarczyk, B. Kłos, G. Sterzenbach, B. Lorentz, Oleksandr Rundel, M. Żurek, S. Schadmand, Paweł Moskal, A. Goswami, Marcin Zieliński, E. Stephan, Wiktor Parol, Pawel Marciniewski, Ralf Engels, Di. Kirillov, P. Kulessa, W. Erven, H. Clement, Wojciech Krzemien, Satoru Hirenzaki, V. Serdyuk, M. Berłowski, Günter Kemmerling, Jerzy Smyrski, Stanisław Kistryn, W. Augustyniak, K. Föhl, Ankhi Roy, A. Khreptak, T. Skorodko, Lena Heijkenskjöld, D. Prasuhn, W. Eyrich, Magnus Wolke, Markus Büscher, J. Zabierowski, M. Bashkanov, N.M. Piskunov, Antoni Szczurek, N. G. Kelkar, A. Erven, H. Ströher, Eryk Czerwiński, Harald Kleines, K. Lalwani, Frank Goldenbaum, Steven D. Bass, P. Żuprański, Hans Calén, Kjell Fransson, K. Pysz, P. Fedorets, J. Stepaniak, H. P. Morsch, H. Ohm, P. Adlarson, and Magdalena Skurzok

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Eta meson, Detector, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, Bound state, medicine, Order (group theory), High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleus
Abstract

We report on the experimental search for the bound state of an eta meson and He-3 nucleus performed using the WASA-at-COSY detector setup. In order to search for the eta-mesic nucleus decay, the pd ...

Published
2020

5. Total and differential cross sections of η -production in proton–deuteron fusion for excess energies between Q η = 13 MeV and Q η = 81 MeV

Author

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

Subjects
Nuclear and High Energy Physics, eta meson, Proton, Meson, Hadron, Nuclear Theory, Elementary particle, η meson, 7. Clean energy, 01 natural sciences, Nuclear physics, Subatomär fysik, proton–deuteron interactions, Astronomi, astrofysik och kosmologi, 0103 physical sciences, протон-дейтронные взаимодействия, Subatomic Physics, Astronomy, Astrophysics and Cosmology, ddc:530, 010306 general physics, Nuclear Experiment, Boson, Physics, 010308 nuclear & particles physics, Eta meson, Meson production, lcsh:QC1-999, Deuterium, meson production, Proton-deuteron interactions, \eta meson, мезоны, Physics::Accelerator Physics, High Energy Physics::Experiment, ηмезоны, Beam (structure), lcsh:Physics
Abstract

New data on both total and differential cross sections of the production of η mesons in proton–deuteron fusion to He3η in the excess energy region 13.6MeV≤Qη≤80.9MeV are presented. These data have been obtained with the WASA-at-COSY detector setup located at the Forschungszentrum Jülich, using a proton beam at 15 different beam momenta between pp=1.60GeV/c and pp=1.74GeV/c. While significant structure of the total cross section is observed in the energy region 20MeV≲Qη≲60MeV, a previously reported sharp variation around Qη≈50MeV cannot be confirmed. Angular distributions show the typical forward-peaking that was noted earlier. For the first time, it is possible to study the development of these angular distributions with rising excess energy over a wide interval.

Published
2018

6. 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

7. Spin dependence of {\eta} meson production in proton-proton collisions close to threshold

Author

M. Bashkanov, Günter Kemmerling, A. Erven, I. Schätti-Ozerianska, K. Sitterberg, G. Sterzenbach, W. Eyrich, A. Magiera, B. Lorentz, H. P. Morsch, O. Khreptak, Ralf Engels, N. Hüsken, Paweł Moskal, Zbigniew Rudy, Marcin Zieliński, Eryk Czerwiński, C.-O. Gullström, Markus Büscher, Harald Kleines, Ankhi Roy, W. Bardan, Aleksandra Wrońska, Hans Calén, E. Perez del Rio, T. Sefzick, Stanisław Kistryn, J. Zabierowski, K. Pysz, V. Hejny, Akira Yamamoto, Kjell Fransson, Lena Heijkenskjöld, D. Prasuhn, Antoni Szczurek, A. Khoukaz, Magdalena Skurzok, B. Mariański, K. Grigoryev, Jozef Zlomanczuk, Wojciech Krzemien, V. Sopov, Andrzej Kupsc, Patrik Adlarson, Frank Goldenbaum, Pawel Marciniewski, Damian Pszczel, B. Shwartz, J. Stepaniak, P. Zupranski, D. Lersch, J. Ritman, A. Trzcinski, G. Khatri, P. Fedorets, W. Augustyniak, Tord Johansson, L. Jarczyk, W. Erven, V. Serdyuk, Steven D. Bass, H. Ohm, H. Clement, M. Berłowski, K. Föhl, K. Lalwani, A. Bondar, H. Stroeher, Maria Zurek, Jerzy Smyrski, B. Kamys, P. Wüstner, B. Kłos, T. Skorodko, S. Schadmand, K. Demmich, A. Pyszniak, S. Sawant, Di. Kirillov, A. Kuzmin, F. S. Bergmann, Magnus Wolke, Izabela Ciepał, A. Goswami, Hans Stockhorst, Rolf Stassen, Rudolf Maier, P. Kulessa, Wiktor Parol, Oleksandr Rundel, E. Stephan, and N.M. Piskunov

Subjects
Nuclear Theory, General Physics and Astronomy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, 0103 physical sciences, ddc:530, FACILITY, NEAR-THRESHOLD, 010306 general physics, NUCLEON, Nuclear Experiment, Nuclear theory, Physics, QUASI-FREE, 010308 nuclear & particles physics, Eta meson, Detector, COSY, Polarization (waves), Near threshold, High Energy Physics - Phenomenology, Physics::Accelerator Physics, Axial symmetry, Nucleon
Abstract

Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high degree of the polarized proton beam of COSY, the reaction pp{\to} pp{\eta} has been measured close to threshold to explore the analyzing power Ay. The angular distribution of Ay is determined with the precision improved by more than one order of magnitude with respect to previous results allowing a first accurate comparison with theoretical predictions. The determined analyzing power is consistent with zero for an excess energy of Q = 15 MeV signaling s wave production with no evidence for higher partial waves. At Q = 72 MeV the data reveals strong interference of P s and P p partial waves and cancellation of (P p) and Ss*Sd contributions. These results rule out the presently available theoretical predictions for the production mechanism of the {\eta} meson., Comment: Accepted for publication in Phys. Rev. Lett

Published
2017

8. 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

9. Polarisation of the ω meson in the pd→He3ω reaction at 1360 and 1450 MeV

Author

P. Thörngren Engblom, A. Kupść, A. Povtorejko, S. Keleta, Bo Höistad, J. Stepaniak, Wolfgang Scobel, G. Ivanov, R. J. M. Y. Ruber, A. Kuzmin, K. Fransson, K. Lindberg, P.-E. Tegnér, Leif Gustafsson, Hans Calén, Marek Jacewicz, Magnus Wolke, P. Marciniewski, W. Oelert, H. Pettersson, S. Kullander, M. Bashkanov, Chr. Bargholtz, B. Shwartz, D. Bogoslawsky, Jozef Zlomanczuk, L. Demirörs, A. Turowiecki, F. Kren, J. Zabierowski, R. Shafigullin, G. J. Wagner, K. Schönning, T. Skorodko, Y. Petukhov, I. Zartova, C. Wilkin, C. Pauly, C. Ekström, V. Tikhomirov, L. Geren, O. Khakimova, H. Clement, T. Johansson, I. Koch, E. Jiganov, B. Morosov, M. Berlowski, and V. Sopov

Subjects
Physics, Nuclear and High Energy Physics, Meson production, Meson, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Coincidence, Nuclear physics, Near threshold, Low energy, OZI rule, High Energy Physics::Experiment, Tensor, Nuclear Experiment
Abstract

The tensor polarisation of ω mesons produced in the p d → He 3 ω reaction has been studied at two energies near threshold. The He 3 nuclei were detected in coincidence with the π 0 π + π − or π 0 γ decay products of the ω . In contrast to the case of ϕ -meson production, the ω mesons are found to be unpolarised. This brings into question the applicability of the Okubo–Zweig–Iizuka rule when comparing the production of vector mesons in low energy hadronic reactions.

Published
2008

10. Tagging of η mesons using the pd → 3Heη reaction near threshold

Author

R. Shafigullin, V.S Karpuhkin, B. A. Chernyshev, Yu. B. Gurov, K. Lindberg, V. Sopov, V. A. Matveev, V.N. Grebenev, Chr. Bargholtz, B.V Martemyanov, I. V. Laukhin, I. Zartova, L. Geren, and P.-E. Tegnér

Subjects
Nuclear physics, Physics, Near threshold, Theoretical physics, Meson, Spectrometer, High Energy Physics::Phenomenology, Nuclear Theory, Computer Science::Computation and Language (Computational Linguistics and Natural Language and Speech Processing), High Energy Physics::Experiment, Nuclear Experiment, Instrumentation, Ion
Abstract

A zero-degree spectrometer for tagging η mesons on the CELSIUS/WASA facility is described, and its characteristics are presented. Tagging of η mesons is performed by detecting 3He ions produced by ...

Published
2006

11. 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

12. 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

13. Recent results from the CELSIUS/WASA collaboration on meson production in proton-hydrogen collisions

Author

R. Bilger, A. Bondar, W. Brodowski, H. Calen, H. Clement, J. Dyring, C. Ekström, K. Fransson, L. Gustafsson, S. Häggström, B. Höistad, J. Johanson, A. Johansson, T. Johansson, K. Kilian, S. Kullander, A. Kupsc, A. Kuzmin, P. Marciniewski, B. Morosov, A. Mörtsell, W. Oelert, A. Povtorejko, R.J.M.Y. Ruber, U. Schuberth, T. Sefzick, V. Sidorov, B. Shwartz, V. Sopov, J. Stepaniak, A. Sukhanov, V. Tchernychev, A. Turowiecki, G. Wagner, Z. Wilhelmi, J. Zabierowski, A. Zernov, and J. Zlomanczuk

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Proton, Meson, Nuclear Theory, Hadron, Threshold energy, Nuclear physics, Pion, Deuterium, Physics::Accelerator Physics, Center of mass, Nuclear Experiment
Abstract

Different π and η meson production channels in proton-proton and proton-deuteron collisions have been studied at the CELSIUS storage ring using an internal cluster-jet target setup [1]. During the last years more emphasis has been put on ππ and all but one of the possible channels in proton-proton collisions have been studied. Recently also the quasi-free p+nd+η reaction cross section has been measured at threshold using 1295 MeV protons and target deuterium. Excess energies from threshold to 10 MeV in the center of mass of the final dη system were covered. Approaching the threshold the cross section is enhanced compared to phase-space expectations. This behaviour is typical for a strong final-state interaction.

Published
1999

14. Excitation of the Roper resonance in single- and double-pion production in nucleon-nucleon collisions⋆

Author

B. Morosov, Henrik Petterson, K. Franssen, E. Jiganov, M. Wolke, Hans Calén, O. Khakimova, F. Cappellaro, T. Skorodko, Karin Schönning, L. Gustafsson, H. Clement, P. Thörngren-Engblom, I. Koch, L. Demiroers, B.A. Shwartz, J. Stepeniak, R. Meier, D. Duniec, Sven Kullander, G. Ivanov, P. Marciniewski, G.J. Wagner, Akira Yamamoto, A. Povtorejko, Marek Jacewicz, M. Bashkanov, A. A. Kuznetsov, Curt Ekstrom, Y. Petukhov, M. Kaskulov, V. Sopov, J. Zlomanczuk, F. Kren, Bo Höistad, Wolfgang Scobel, C. Pauly, V. Tikhomirov, E. Doroshkevich, J. Zabierowski, S. Keleta, A. Kupść, D. Bogoslawsky, and Tord Johansson

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle decay, Roper resonance, Pair production, Pion, Meson, Branching fraction, Nuclear Theory, Nuclear Experiment, Nucleon, Excitation
Abstract

In most investigations the Roper resonance is sensed only very indirectly via complex partial-wave analyses. We find indications for its excitation in the invariant nπ+ mass spectrum of the pp → npπ+ reaction at M ≈ 1360 MeV with a width of ≈ 150 MeV . The values fit very favorably to the most recent phase shift results as well as to the observations at BES. In the near-threshold two-pion production pp → ppπ0π0 , where the Roper excitation and its subsequent decays via the routes N * → Δπ → Nππ and N * → Nσ are the only dominant processes, we find its direct decay into the Nσ channel to be the by far dominating decay process --in favor of a monopole excitation of the Roper resonance.

Published
2008

15. Threshold Structure of the Quasifreep+n→d+ηReaction

Author

H. Calén, J. Dyring, K. Fransson, L. Gustafsson, S. Häggström, B. Höistad, J. Johanson, A. Johansson, T. Johansson, A. Khoukaz, S. Kullander, R. J. M. Y. Ruber, J. Złomańczuk, B. Morosov, A. Povtorejko, A. Sukhanov, A. Zernov, A. Kupść, P. Marciniewski, J. Stepaniak, R. Bilger, W. Brodowski, H. Clement, G. J. Wagner, C. Ekström, J. Zabierowski, A. Bondar, A. Kuzmin, B. Shwartz, V. Sidorov, A. Turowiecki, Z. Wilhelmi, K. Kilian, W. Oelert, T. Sefzick, V. Sopov, and V. Tchernychev

Subjects
Physics, Cross section (physics), Deuterium, Proton, Nuclear Theory, Physics::Accelerator Physics, General Physics and Astronomy, Atomic physics, Nuclear Experiment, Storage ring
Abstract

The quasifree p + n --> d + eta reaction cross section has been measured at the threshold using 1295 MeV protons in the CELSIUS storage ring and an internal cluster-jet deuterium target. The kinematics is chosen such that the target proton can be assumed

Published
1998

16. 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

17. Detector setup for a storage ring with an internal target

Author

H. Calén, S. Carius, K. Fransson, L. Gustafsson, S. Häggström, B. Höistad, A. Johansson, T. Johansson, S. Kullander, A. Mörtsell, J. Möhn, R. Ruber, U. Schuberth, J. Złomańczuk, C. Ekström, C.-J. Fridén, D. Reistad, K. Kilian, W. Oelert, V. Renken, T. Sefzick, M. Waters, A. Bondar, G. Kolachev, A. Kuzmin, T. Purlatz, B. Shwartz, V. Sidorov, A. Sukhanov, A. Kupść, P. Marciniewski, A. Nawrot, J. Stepaniak, D. Bogoslawsky, V. Dunin, A. Kuznetsov, B. Morosov, A. Povtorejko, S. Sandukovsky, A. Zernov, J. Zabierowski, A. Turowiecki, Z. Wilhelmi, Z. Pawlowski, R. Bilger, W. Brodowski, H. Clement, G. Kurz, G.J. Wagner, A. Martemyanov, V. Sopov, V. Tchernyshev, E. David, M. Price, and C. Rivoiron

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Photon, Physics::Instrumentation and Detectors, Nuclear Theory, Detector, Scintillator, Particle detector, Charged particle, Scintillation counter, Atomic physics, Nuclear Experiment, Instrumentation, Storage ring
Abstract

A detector setup for the cooler storage ring CELSIUS is described. The setup detects particles produced in interactions between the internal beam and a cluster-jet target. Particles emitted in the forward direction are measured by means of arrays of plastic scintillators and proportional counters. Particles, particularly photons, emitted more isotropically are measured by means of two calorimeters containing CsI(Na) crystals. The performance of the setup is given for neutral meson production in proton-proton and proton-deuteron interactions in the energy range 290–1360 MeV.

Published
1996

18. The WASA Detector Facility at CELSIUS

Author

Chr. Bargholtz, M. Bashkanov, M. Berłowski, A. Bondar, D. Bogoslawsky, W. Brodowski, J. Brudvik, H. Calén, F. Capellaro, A. Chilingarov, H. Clement, J. Comfort, L. Demirörs, C. Ekström, K. Fransson, C.-J. Fridén, L. Gerén, M. Gornov, V. Grebenev, J. Greiff, Y. Gurov, L. Gustafsson, B. Höistad, G. Ivanov, M. Jacewicz, E. Jiganov, A. Johansson, T. Johansson, S. Keleta, O. Khakimova, A. Khoukaz, K. Kilian, N. Kimura, I. Koch, G. Kolachev, F. Kren, S. Kullander, A. Kupść, A. Kuzmin, A. Kuznetsov, K. Lindberg, P. Marciniewski, R. Meier, O. Messner, B. Morosov, A. Nawrot, B.M.K. Nefkens, G. Norman, W. Oelert, C. Pauly, H. Pettersson, A. Pivovarov, J. Pätzold, Y. Petukhov, A. Povtorejko, D. Reistad, R.J.M.Y. Ruber, S. Sandukovsky, K. Schönning, W. Scobel, T. Sefzick, R. Shafigullin, B. Shwartz, V. Sidorov, T. Skorodko, V. Sopov, A. Starostin, J. Stepaniak, A. Sukhanov, V. Tchernyshev, P.-E. Tegnér, P. Thörngren Engblom, V. Tikhomirov, H. Toki, A. Turowiecki, G.J. Wagner, U. Wiedner, Z. Wilhelmi, M. Wolke, A. Yamamoto, H. Yamaoka, J. Zabierowski, I. Zartova, and J. Złomańczuk

Subjects
Nuclear and High Energy Physics, Particle physics, Meson production, Meson, data acquisition, electromagnetic [calorimeter], Nuclear Theory, decay modes [eta], pellet target, FOS: Physical sciences, scintillators, multidetector system, Particle detector, Nuclear physics, Degree Celsius, calorimeter, ddc:530, hadroproduction [meson], Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, scintillation counter, forward spectrometer, Physics, Eta meson, Detector, trigger, scattering [ion], Uppsala CELSIUS Stor, mini drift chambers, performance [four-pi-detector], drift chamber, target [hydrogen], solenoid [superconductivity], High Energy Physics::Experiment, Storage ring
Abstract

The WASA 4pi multidetector system, aimed at investigating light meson production in light ion collisions and eta meson rare decays at the CELSIUS storage ring in Uppsala is presented. A detailed description of the design, together with the anticipated and achieved performance parameters are given., 25 pages, 20 figures

Published
2008

19. Excitation of the Roper resonance in single- and double-pion production in nucleon-nucleon collisions

Author

M. Bashkanov, L. Gustafsson, Wolfgang Scobel, O. Khakimova, Y. Petukhov, I. Koch, Henrik Petterson, Karin Schönning, E. Jiganov, C. Pauly, G. Ivanov, L. Demiroers, D. Duniec, S. Keleta, B.A. Shwartz, Curt Ekstrom, Sven Kullander, A. A. Kuznetsov, Marek Jacewicz, A. Povtorejko, V. Tikhomirov, Akira Yamamoto, H. Clement, E. Doroshkevich, F. Cappellaro, B. Morosov, Bo Höistad, J. Zabierowski, M. Kaskulov, V. Sopov, J. Zlomanczuk, F. Kren, J. Stepeniak, P. Thörngren-Engblom, R. Meier, G.J. Wagner, K. Franssen, A. Kupść, D. Bogoslawsky, M. Wolke, Hans Calén, Tord Johansson, P. Marciniewski, and T. Skorodko

Subjects
Physics, Nuclear physics, Roper resonance, Pion, Nuclear Theory, Mass spectrum, Magnetic monopole, Production (computer science), Nuclear Experiment, Nucleon, Excitation
Abstract

In most investigations the Roper resonance is sensed only very indirectly via complex partial-wave analyses. We find indications for its excitation in the invariant nπ+ mass spectrum of the pp → npπ+ reaction at M ≈ 1360 MeV with a width of ≈ 150 MeV . The values fit very favorably to the most recent phase shift results as well as to the observations at BES. In the near-threshold two-pion production pp → ppπ0π0 , where the Roper excitation and its subsequent decays via the routes N * → Δπ → Nππ and N * → Nσ are the only dominant processes, we find its direct decay into the Nσ channel to be the by far dominating decay process --in favor of a monopole excitation of the Roper resonance.

Published
2008

20. Single- and Double-Pion Production in Nucleon Collisions on the Nucleon and on Nuclei -- the ABC Effect and its Possible Origin in a Dibaryonic Resonance

Author

H. Clement, M. Bashkanov, C. Bargholtz, D. Bogoslawsky, H. Calen, F. Cappellaro, L. Demiroers, E. Doroshkevich, D. Duniec, C. Ekström, K. Franssen, L. Geren, L. Gustafsson, B. Höistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, M. Kaskulov, O. Khakimova, S. Keleta, I. Koch, F. Kren, S. Kullander, A. Kupść, A. Kuznetsov, K. Lindberg, P. Marciniewski, R. Meier, B. Morosov, C. Pauly, H. Petterson, Y. Petukhov, A. Povtorejko, A. Pricking, K. Schönning, W. Scobel, B. Shwartz, T. Skorodko, V. Sopov, J. Stepeniak, P.-E. Tegner, P. Thörngren-Engblom, V. Tikhomirov, G.J. Wagner, M. Wolke, A. Yamamoto, J. Zabierowski, I. Zartova, and J. Złomanczuk

Subjects
Physics, Nuclear and High Energy Physics, Isoscalar, Nuclear Theory, Resonance, FOS: Physical sciences, Context (language use), Nuclear physics, Pion, Nuclear fusion, Invariant mass, Production (computer science), Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment
Abstract

The ABC effect -- an intriguing low-mass enhancement in the $\pi\pi$ invariant mass spectrum -- is known from inclusive measurements of two-pion production in nuclear fusion reactions. First exclusive measurements carried out at CELSIUS-WASA for the fusion reactions leading to d or $^3$He reveal this effect to be a $\sigma$ channel phenomenon associated with the formation of a $\Delta\Delta$ system in the intermediate state and combined with a resonance-like behavior in the total cross section. Together with the observation that the differential distributions do not change in shape over the resonance region the features fulfill the criteria of an isoscalar s-channel resonance in $pn$ and $NN\pi\pi$ systems, if the two emitted nucleons are bound. It obviously is robust enough to survive in nuclei as a dibaryonic resonance configuration. In this context also the phenomenon of $N\Delta$ resonances is reexamined., Comment: 8 pages,3 figures, Proc. Int. School Nucl. Phys., 29th course on Quarks in Hadrons and Nuclei, Erice 2007 (to be published in Progress in Particle and Nuclear Physics)

Published
2007
Full Text
View/download PDF

21. Evidence for F∗ meson production in e+e− annihilation at 10 GeV center-of-mass energy

Author

Robert K. Kutschke, A. Philipp, P. C. H. Kim, J. Spengler, Wr Frisken, G. Drews, P. Böckmann, D. Wegener, V. Nagovitsin, B. J. Stacey, C. W. Darden, Leif J. Jönsson, K. R. Schubert, D. Coppage, H. Seywerd, M. Danilov, S. Weseler, Roland Waldi, F. Selonke, A. Drescher, J. C. Yun, Y. Oku, J. D. Prentice, R. Wurth, P. M. Patel, V. Lubimov, H. Gennow, A. W. Nilsson, H. D. Schulz, V. Sopov, T. S. Yoon, W. Schmidt-Parzefall, R. Heller, Yu. Semenov, K. W. McLean, I. Tichomirov, J. A. McKenna, R. Ammar, D. B. MacFarlane, H. Scheck, K. W. Edwards, S. Kanekal, U. Matthiesen, Raymond Davis, R. Childers, H. Schröder, H. Hasemann, Yu. Zaitsev, M. Goddard, H. Albrecht, V. Matveev, V. Soloshenko, N. Kwak, V. Shevchenco, B. Gräwe, G. Harder, P. Padley, R. S. Orr, J. Stiewe, C. Fukunaga, and V. Ryltsov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Argus, Photon, Meson production, Annihilation, Meson, High Energy Physics::Lattice, Electron–positron annihilation, High Energy Physics::Phenomenology, Nuclear Theory, Resonance, Nuclear physics, High Energy Physics::Experiment, Center of mass, Nuclear Experiment, computer, computer.programming_language
Abstract

Using the ARGUS detector at DORIS we have obtained evidence for a resonance which decays into an F meson and a photon. The observed mass is 2109 ± 9 ± 7 MeV, which is 144 ± 9 ± 7 MeV greater than the F meson mass. Its properties are consistent with those of the F ∗ meson with J P = 1 − .

Published
1984

22. A precision measurement of the ϒ′ meson mass

Author

V. Matveev, S. Keh, R. Lee, N. Kwak, H. Mais, B. Monteleoni, W. Maschmann, V. Soloshenko, S. Lowe, Robert Hofstadter, M. Danilov, A. Phillipp, V. Sopov, H. Schröder, R. Clare, U. Strohbusch, H. C. Lewin, R. S. Orr, G. Folger, D. Coppage, K. Wacker, P. Schmitt, K. R. Schubert, F. H. Heimlich, J. K. Bienlein, R. Rossmanith, P. Lezoch, Yu. Zaitsev, A.M. Cartacci, W. Koch, C. W. Darden, R. Nernst, V. Tchistilin, S. Leffler, G. Nowak, Elliott D. Bloom, J. Tompkins, T. Limberg, G. Godfrey, R. Heller, D. Coyne, P. G. Pelfer, P. Zschorsch, H. Albrecht, H. Wegener, B. Gomez, F. Zwack, H. D. Bremer, R. Cabenda, R. Schmidt, W. Schmidt-Parzefall, Axel König, Ian Brock, Daniel Robert Marlow, A. Markees, A. Arefiev, A. Engler, Yu. Semenov, V. Tchernyshew, K. Königsmann, J. Gaiser, Z. Jakubowski, J. Stiewe, I. Kirkbride, H. Kilian, D. Wegener, T. S. Yoon, T. Skwarnicki, T. Matsui, R. Ammar, Raymond Davis, M. Goddard, H. Seywerd, J. Kewisch, W. Hofmann, K. Edwards, A. Fridman, S. Cooper, G. Drews, D. de Judicibus, A. Schwarz, A. M. Litke, H. D. Schulz, H. J. Trost, Y. Oku, P. Ratoff, D. G. Aschman, F. Messing, Roland Waldi, T. Kloiber, D. Sievers, U. Matthiesen, V. Nagovitsin, D. Antreasyan, Frank C. Porter, C. W. Peck, M. Schmitz, J. Schotanus, Leif J. Jönsson, J. Irion, W. Lockman, C. Rippich, K. Strauch, H. Gennow, S. Weseler, M. Scheer, P. M. Patel, C. Newman-Holmes, R. Lekebusch, C. Edwards, B. Lurz, V. Lubimov, G. Conforto, B. Niczyporuk, D. Gelphman, R. Wurth, W. Walk, R. Chestnut, G. Ripken, R. T. Van de Walle, J. D. Prentice, D. Prindle, P. Kim, P. Boeckmann, R. W. Kraemer, D. P. Barber, J. Spengler, C. Fukunaga, R. Cowan, A. Drescher, M. Cavalli-Sforza, F. Selonke, H. Hasemann, U. Volland, I. Tichomirov, D. Besset, B. Renger, R. Childers, B. Pollock, B. Gräwe, W.R. Frisken, and V. Shevchenco

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Argus, Meson, Electron–positron annihilation, Nuclear Theory, Hadron, Resonance, Nuclear physics, Physics::Accelerator Physics, Nuclear Experiment, computer, Crystal Ball, Storage ring, computer.programming_language
Abstract

The e + e − -storage ring DORIS II provides polarized beams with polarizations up to 80% in the energy range of the ϒ ′ meson. The method of resonance depolarization allows the average beam energy to be determined to a precision of ±0.1 MeV. An energy scan of the hadronic cross section over the resonance range with the detectors ARGUS and Crystal Ball determines the ϒ ′ mass to be (10023.1 ± 0.4) MeV.

Published
1984

23. Production and decay of the F meson in e+e− annihilation at 10 GeV centre-of-mass energy

Author

J. Stiewe, D. Wegener, M. Goddard, H. Schröder, A. Philipp, A. Markees, Robert K. Kutschke, J. Spengler, Y. Oku, N. N. Brown, I. Tikhomirov, D. J. Gilkinson, H. Gennow, W. Schmidt-Parzefall, D. Coppage, R. S. Orr, V. Soloshenko, B. J. Stacey, A. Drescher, J. C. Yun, B.Paul Padley, C. W. Darden, Viktor Matveev, V. Ryltsov, V. Sopov, H. Scheck, N. Nagovitsyn, Leif J. Jönsson, V. Lyubimov, R. Ammar, D. B. MacFarlane, Doug Gingrich, R. Davis, T. S. Yoon, H. Albrecht, R. Heller, William R. Frisken, R. Childers, R. Wurth, U. Binder, Holger Schulz, Yu. Semenov, F. Selonke, Mikhail Danilov, K. W. McLean, K. W. Edwards, J. A. McKenna, P. M. Patel, S. Kanekal, U. Matthiesen, P. C. H. Kim, V. Shevchenko, C. Fukunaga, A. Semenov, H. Seywerd, Werner Hofmann, Yu. Zaitsev, R. Waldi, G. Drews, J. D. Prentice, A. W. Nilsson, B. Gräwe, G. Harder, N. Kwak, K. R. Schubert, S. Weseler, H. Hasemann, and P. Böckmann

Subjects
Quark, Physics, Nuclear and High Energy Physics, Argus, Annihilation, Meson, Branching fraction, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Nuclear physics, Momentum, High Energy Physics::Experiment, Center of mass, Nuclear Experiment, computer, computer.programming_language
Abstract

Using the ARGUS detector at DORIS, we have observed the production of F ± mesons in e + e − annihilation at a centre of mass energy of 10 GeV through their subsequent decays into φπ ± and φπ + π − π ± . The values obtained for [ R (e + e − →FX). Branching Ratio] are (1.47 ± 0.32 ± 0.20)% and (1.63 ± 0.42 ± 0.41)% respectively. The observed mass is (1973.6 ± 2.6 ± 3.0) MeV c 2 . The F momentum spectrum is as expected for the fragmentation of c quarks into charmed mesons, but is somewhat softer than for fragmentation into D ∗ mesons. The relevant angular distributions are consistent with a spin-zero assignment of the F meson.

Published
1985

Catalog

Books, media, physical & digital resources
See catalog results