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

Author: Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Buescher, M., Calén, Hans, Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell E. I., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullstrom, Carl-Oscar, Hauenstein, F., Heijkenskjöld, Lena, Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krapp, M., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Ozerianska, I., del Rio, E. Perez, Plucinski, P., Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, Zupranski, P., Zurek, M., Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Buescher, M., Calén, Hans, Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell E. I., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullstrom, Carl-Oscar, Hauenstein, F., Heijkenskjöld, Lena, Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krapp, M., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Ozerianska, I., del Rio, E. Perez, Plucinski, P., Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, Zupranski, P., and Zurek, M.
Abstract: Exclusive and kinematically complete high-statistics measurements of the basic double-pionic fusion reactions pn -> d pi(0)pi(0), pn -> d pi(+)pi(-) and pp -> 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(0) 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
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202. Search for eta-mesic He-4 with the WASA-at-COSY detector

Author: Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Buescher, M., Calén, Hans, Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, Carl-Oscar, Hauenstein, F., Heijkenskjöld, Lena, Hejny, V., Hinterberger, F., Hodana, M., Hoistad, Bo, Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krapp, M., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Ozerianska, I., del Rio, E. Perez, Plucinski, P., Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, Zupranski, P., Zurek, M., Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Buescher, M., Calén, Hans, Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, Carl-Oscar, Hauenstein, F., Heijkenskjöld, Lena, Hejny, V., Hinterberger, F., Hodana, M., Hoistad, Bo, Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krapp, M., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Ozerianska, I., del Rio, E. Perez, Plucinski, P., Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, Zupranski, P., and Zurek, M.
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 taken during a slow acceleration of the beam from 2.185 to 2.400 GeV/c crossing the kinematic threshold for the eta-meson production in the dd -> He-4 eta reaction at 2.336 GeV/c. The corresponding excess energy with respect to the He-4-eta system varied from -51.4 to 22 MeV. The integrated luminosity in the experiment was determined using the dd -> (3)Hen reaction. The shape of the excitation function for the dd -> (3)Hep pi(-) reaction was examined. No signal of the He-4-eta bound state was observed. An upper limit for the cross section for the bound state formation and decay in the process dd -> (He-4-eta)(bound) -> (3)Hep pi(-) was determined on the 90% confidence level and it varies from 20 to 27 nb for the bound state width ranging from 5 to 35 MeV, respectively.
Published: 2013
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203. Investigation of the dd -> (3)Hen pi(0) reaction with the FZ Julich WASA-at-COSY facility

Author: Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell E. I., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, Carl-Oscar, Hanhart, C., Hauenstein, F., Heijkenskjöld, Lena, Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krapp, M., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N. M., Plucinski, P., Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schmidt, A., Schadmand, S., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Wagner, G. J., Weglorz, W., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yuan, X., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Josef, Zupranski, P., Zurek, M., Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell E. I., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, Carl-Oscar, Hanhart, C., Hauenstein, F., Heijkenskjöld, Lena, Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krapp, M., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N. M., Plucinski, P., Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schmidt, A., Schadmand, S., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Wagner, G. J., Weglorz, W., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yuan, X., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Josef, Zupranski, P., and Zurek, M.
Abstract: An exclusive measurement of the dd -> (3)Hen pi(0) reaction was carried out at a beam momentum of p(d) = 1.2 GeV/c using the WASA-at-COSY facility. Information on the total cross section as well as differential distributions was obtained. The data are described by a phenomenological approach based on a combination of a quasifree model and a partial wave expansion for the 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 quasifree processes ( with the beam or target neutron being a spectator) accounts for 38% of the total cross section and dominates the differential distributions in specific regions of phase space. The remaining part of the cross section can be described by a partial wave decomposition indicating the significance of p-wave contributions in the final state.
Published: 2013
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204. Measurement of the pn -> pp pi(0)pi(-) reaction in search for the recently observed resonance structure in d pi(0)pi(0) and d pi(+)pi(-) systems

Author: Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell E. I., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, Carl-Oscar, Hauenstein, F., Heijkenskjöld, Lena, Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krapp, M., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N. M., Plucinski, P., Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schmidt, A., Schadmand, S., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Wagner, G. J., Eglorz, W. W., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yuan, X., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, Zupranski, P., Zurek, M., Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell E. I., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, Carl-Oscar, Hauenstein, F., Heijkenskjöld, Lena, Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krapp, M., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N. M., Plucinski, P., Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schmidt, A., Schadmand, S., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Wagner, G. J., Eglorz, W. W., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yuan, X., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, Zupranski, P., and Zurek, M.
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 the cooler synchrotron COSY (Institut fur Kernphysik, Julich). Total and differential cross sections have been obtained covering the energy region root s = (2.35-2.46) GeV, which includes the region of the ABC effect and its associated resonance structure. NoABCeffect, i.e., low-mass enhancement is found in the pi(0)pi(-) -invariant mass spectrum, in agreement with the constraint from Bose statistics that the isovector pion pair can not be in relative s wave. At the upper end of the covered energy region t-channel processes for Roper, Delta(1600) and Delta Delta excitations provide a reasonable description of the data, but at low energies the measured cross sections are much larger than predicted by such processes. Adding a resonance amplitude for the resonance at m = 2.37 GeV with Gamma = 70 MeV and I (J(P)) = 0(3(+)) observed recently in pn -> d pi(0)pi(0) and pn -> d pi(+)pi(-) reactions leads to an agreement with the data also at low energies.
Published: 2013
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205. Search for a dark photon in the $\pi^0 \to e^+e^-\gamma$ decay

Author: Collaboration, WASA-at-COSY, Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Coderre, D., Czerwiński, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C. -O., Hauenstein, F., Heijkenskjöld, L., Hejny, V., Hinterberger, F., Hodana, M., Höistad, B., Jany, A., Jany, B. R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Kłos, B., Krapp, M., Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Meißner, U. -G., Mikirtychiants, M., Morsch, H. -P., Moskal, P., Nandi, B. K., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N., Pluciński, P., Podkopał, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Shwartz, B., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Tolba, T., Trzciński, A., Varma, R., Wagner, G. J., Wȩglorz, W., Wirzba, A., Wolke, M., Wrońska, A., Wüstner, P., Wurm, P., Yamamoto, A., Zabierowski, J., Zieliński, M. J., Zipper, W., Złomańczuk, J., Żuprański, P., Żurek, M., Collaboration, WASA-at-COSY, Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Coderre, D., Czerwiński, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C. -O., Hauenstein, F., Heijkenskjöld, L., Hejny, V., Hinterberger, F., Hodana, M., Höistad, B., Jany, A., Jany, B. R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Kłos, B., Krapp, M., Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Meißner, U. -G., Mikirtychiants, M., Morsch, H. -P., Moskal, P., Nandi, B. K., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N., Pluciński, P., Podkopał, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Shwartz, B., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Tolba, T., Trzciński, A., Varma, R., Wagner, G. J., Wȩglorz, W., Wirzba, A., Wolke, M., Wrońska, A., Wüstner, P., Wurm, P., Yamamoto, A., Zabierowski, J., Zieliński, M. J., Zipper, W., Złomańczuk, J., Żuprański, P., and Żurek, M.
Abstract: The presently world largest data sample of pi0 --> gamma e+e- decays containing nearly 5E5 events was collected using the WASA detector at COSY. A search for a dark photon U produced in the pi0 --> gamma U --> gamma e+e- decay from the pp-->pp\pi^0 reaction was carried out. An upper limit on the square of the U-gamma mixing strength parameter epsilon^2 of 5e-6 at 90% CL was obtained for the mass range 20 MeV
Published: 2013
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206. pi(0)pi(0) Production in proton-proton collisions at T-p=1.4 GeV The WASA-at-COSY Collaboration

Author: Adlarson, Patrik, Adolph, C., Augustyniak, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Brinkmann, K. -T, Buescher, M., Calén, Hans, Clement, H., Coderre, D., Czerwinski, E., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goslawski, P., Grigoryev, K., Gullström, Carl-Oskar, Heijkenskjöld, Lena, Heimlich, J., Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Jacewicz, Marek, Janusz, M., Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khakimova, O., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Kren, F., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lorentz, B., Magiera, A., Maier, R., Marianski, B., Marciniewski, Pawel, Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Passfeld, A., Pauly, C., del Rio, E. Perez, Petukhov, Y., Piskunov, N., Plucinski, Pawel, Podkopal, P., Povtoreyko, A., Prasuhn, D., Pricking, A., Pysz, K., Rausmann, T., Redmer, Christoph F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Taeschner, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Wiedner, U., Winnemoeller, A., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, Zupranski, P., Adlarson, Patrik, Adolph, C., Augustyniak, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Brinkmann, K. -T, Buescher, M., Calén, Hans, Clement, H., Coderre, D., Czerwinski, E., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goslawski, P., Grigoryev, K., Gullström, Carl-Oskar, Heijkenskjöld, Lena, Heimlich, J., Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Jacewicz, Marek, Janusz, M., Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khakimova, O., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Kren, F., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lorentz, B., Magiera, A., Maier, R., Marianski, B., Marciniewski, Pawel, Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Passfeld, A., Pauly, C., del Rio, E. Perez, Petukhov, Y., Piskunov, N., Plucinski, Pawel, Podkopal, P., Povtoreyko, A., Prasuhn, D., Pricking, A., Pysz, K., Rausmann, T., Redmer, Christoph F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Taeschner, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Wiedner, U., Winnemoeller, A., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, and Zupranski, P.
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(normalization)) mu b. In order to study the production mechanism, differential kinematic distributions have been evaluated. The differential distributions indicate that both initial state protons are excited into intermediate Delta(1232) resonances, each decaying into a proton and a single pion, thereby producing the pion pair in the final state. No significant contribution of the Roper resonance N*(1440) via its decay into a proton and two pions is found.
Published: 2012
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207. Exclusive measurement of the eta -> pi(+) pi(-) gamma decay

Author: Adlarson, Patrik, Adolph, C., Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Brinkmann, K. -T, Buescher, M., Calén, Hans, Clement, H, Coderre, D., Czerwinski, E., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goslawski, P., Grigoryev, K., Gullström, Carl-Oscar, Hanhart, C., Heijkenskjöld, Lena, Heimlich, J., Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Jacewicz, Marek, Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khakimova, O., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Kren, F., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Leupold, Stefan, Lorentz, B., Magiera, A., Maier, R., Marianski, B., Marciniewski, Pawel, Meissner, U-G, Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Passfeld, A., Pauly, C., del Rio, E. Perez, Petri, T., Petukhov, Y., Piskunov, N., Plucinski, Pawel, Podkopal, P., Povtoreyko, A., Prasuhn, D., Pricking, A., Pysz, K., Pyszniak, A., Rausmann, T., Redmer, Cristoph F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., 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., Stollenwerk, F., Stroeher, H., Szczurek, A., Taeschner, A., Terschlüsen, Carla, Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Winnemoeller, A., Wirzba, A., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, Zupranski, P., Adlarson, Patrik, Adolph, C., Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Brinkmann, K. -T, Buescher, M., Calén, Hans, Clement, H, Coderre, D., Czerwinski, E., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goslawski, P., Grigoryev, K., Gullström, Carl-Oscar, Hanhart, C., Heijkenskjöld, Lena, Heimlich, J., Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Jacewicz, Marek, Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khakimova, O., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Kren, F., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Leupold, Stefan, Lorentz, B., Magiera, A., Maier, R., Marianski, B., Marciniewski, Pawel, Meissner, U-G, Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Passfeld, A., Pauly, C., del Rio, E. Perez, Petri, T., Petukhov, Y., Piskunov, N., Plucinski, Pawel, Podkopal, P., Povtoreyko, A., Prasuhn, D., Pricking, A., Pysz, K., Pyszniak, A., Rausmann, T., Redmer, Cristoph F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., 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., Stollenwerk, F., Stroeher, H., Szczurek, A., Taeschner, A., Terschlüsen, Carla, Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Winnemoeller, A., Wirzba, A., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, and Zupranski, P.
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 beam momentum of 1.7 GeV/c. Efficiency corrected differential distributions have been extracted based on 13 960 +/- 140 events after background subtraction. The measured pion angular distribution is consistent with a relative p-wave of the two-pion system, whereas the measured photon energy spectrum was found at variance with the simplest gauge invariant matrix element of eta -> pi(+) pi(-) gamma. A parameterization of the data can be achieved by the additional inclusion of the empirical pion vector form factor multiplied by a first-order polynomial in the squared invariant mass of the pi(+) pi(-) system.
Published: 2012
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208. Abashian-Booth-Crowe resonance structure in the double pionic fusion to He-4

Author: Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Brinkmann, K. -T, Buescher, M., Calén, Hans, Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goslawski, P., Grigoryev, K., Gullström, Carl-Oscar, Hauenstein, F., Heijkenskjöld, Lena, Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Husmann, C., Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Ozerianska, I., Pauly, C., del Rio, E. Perez, Petukhov, Y., Plucinski, Pawel, Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, Andzej, Redmer, Christoph F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Serdyuk, V., Shah, N., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, Zupranski, P., Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Brinkmann, K. -T, Buescher, M., Calén, Hans, Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goslawski, P., Grigoryev, K., Gullström, Carl-Oscar, Hauenstein, F., Heijkenskjöld, Lena, Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Husmann, C., Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Mikirtychiants, M., Morsch, H. -P, Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Ozerianska, I., Pauly, C., del Rio, E. Perez, Petukhov, Y., Plucinski, Pawel, Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, Andzej, Redmer, Christoph F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Serdyuk, V., Shah, N., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, and Zupranski, P.
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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209. Delta Delta excitation in proton-proton induced pi(0)pi(0) production

Author: Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Demiroers, L., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, S. Negasi, Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger, Schönning, Karin, Scobel, W., Shwartz, B., Stepaniak, J., Thorngren-Engblom, P., Tikhomirov, V., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Demiroers, L., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, S. Negasi, Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger, Schönning, Karin, Scobel, W., Shwartz, B., Stepaniak, J., Thorngren-Engblom, P., Tikhomirov, V., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: Exclusive measurements of the pp -> pp pi(0)pi(0) reaction have been performed at CELSIUS/WASA at energies from threshold up to T-p = 1.3 GeV. Total and differential cross sections have been obtained. Here we concentrate on energies T-p >= GeV. where the Delta Delta excitation becomes the leading process. No evidence is found for a significant ABC effect beyond that given by the conventional t-channel Delta Delta excitation. This holds also for the double-pionic fusion to the quasibound He-2. The data are compared to model predictions, which are based on both pi- and rho-exchange. Total and differential cross sections are at variance with these predictions and call for a profound modification of the rho-exchange. A phenomenological modification allowing only a small rho-exchange contribution leads to a quantitative description of the data.
Published: 2011
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210. THE pp -> pp pi(0)pi(0) REACTION AND ITS LIMITING CASE, FUSION TO QUASI-BOUND He-2, IN SEARCH OF THE ABC EFFECT

Author: Skorodko, T., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S. Negasi, Khakimova, O., Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, H., Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, Roger, Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Skorodko, T., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S. Negasi, Khakimova, O., Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, H., Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, Roger, Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: The pi(0)pi(0) production in pp-collisions has been investigated in exclusive and kinematically complete measurements from threshold up to T-p = 1.4 GeV. For incident energies T-p > 1 GeV, i.e. in the region beyond the Roper excitation, the Delta Delta excitation process takes over. The data are well explained by the t-channel Delta Delta process dominated by pion exchange. There is no low-mass enhancement (ABC effect) in the pi(0)pi(0)-invariant mass distribution beyond that given by the conventional t-channel Delta Delta process. This is also true for the limiting case, where the protons are in the quasi-bound He-2 state.
Published: 2011
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211. Abashian-Booth-Crowe Effect in Basic Double-Pionic Fusion : A New Resonance?

Author: Adlarson, Patrik, Adolph, C., Augustyniak, W., Baru, V., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Brinkmann, K. -T, Buescher, M., Calén, Hans, Clement, H., Coderre, D., Czerwinski, E., Doroshkevich, E., Ekstrom, C., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goslawski, P., Grigoryev, K., Grishina, V., Gullström, Carl-Oscar, Hampe, J., Hanhart, C., Heijkenskjöld, Lena, Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Jacewicz, Marek, Janusz, M., Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khakimova, O., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Kren, F., Krzemien, W., Kulessa, P., Kullander, Sven, Kupsc, Andrzej, Lalwani, K., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pavel, Marianski, B., Mikirtychiants, M., Moskal, P., Morsch, H. -P, Nandi, B. K., Niedzwiecki, S., Ohm, H., Passfeld, A., Pauly, C., del Rio, E. Perez, Petukhov, Y., Piskunov, N., Plucinski, Pawel, Podkopal, P., Povtoreyko, A., Prasuhn, D., Pricking, A., Pysz, K., Rausmann, T., Redmer, Christoph F., Ritman, J., Roy, A., Ruber, Roger J. M. Y., 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., Stroeher, H., Szczurek, A., Taeschner, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Winnemoeller, A., Wirzba, A., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, Zupranski, P., Adlarson, Patrik, Adolph, C., Augustyniak, W., Baru, V., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Brinkmann, K. -T, Buescher, M., Calén, Hans, Clement, H., Coderre, D., Czerwinski, E., Doroshkevich, E., Ekstrom, C., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goslawski, P., Grigoryev, K., Grishina, V., Gullström, Carl-Oscar, Hampe, J., Hanhart, C., Heijkenskjöld, Lena, Hejny, V., Hinterberger, F., Hodana, M., Höistad, Bo, Jacewicz, Marek, Janusz, M., Jany, A., Jany, B. R., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khakimova, O., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Kren, F., Krzemien, W., Kulessa, P., Kullander, Sven, Kupsc, Andrzej, Lalwani, K., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pavel, Marianski, B., Mikirtychiants, M., Moskal, P., Morsch, H. -P, Nandi, B. K., Niedzwiecki, S., Ohm, H., Passfeld, A., Pauly, C., del Rio, E. Perez, Petukhov, Y., Piskunov, N., Plucinski, Pawel, Podkopal, P., Povtoreyko, A., Prasuhn, D., Pricking, A., Pysz, K., Rausmann, T., Redmer, Christoph F., Ritman, J., Roy, A., Ruber, Roger J. M. Y., 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., Stroeher, H., Szczurek, A., Taeschner, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Winnemoeller, A., Wirzba, A., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, Jozef, and Zupranski, P.
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
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212. Exclusive measurement of the pp -> nn pi(+)pi(+) reaction at 1.1 GeV

Author: Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Demiroers, L., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, Samson, Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Stepaniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Demiroers, L., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, Samson, Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Stepaniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: First exclusive data for the pp -> nnp(+)pi(+) reaction have been obtained at CELSIUS with the WASA detector setup at a beam energy of T(p) - 1.1 GeV. Total and differential cross-sections disagree with theoretical calculations, which predict the Delta Delta excitation to be the dominant process at this beam energy. Instead, the data require the excitation of one of the nucleons to a higher-lying Delta state, preferably the Delta(1600)P(33), to be the leading process.
Published: 2011
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213. The pd →3Heηπ0 reaction at Tp = 1450 MeV

Author: Schönning, Karin, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demirors, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimowa, O., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P.-E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, Magnus, Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Schönning, Karin, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demirors, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimowa, O., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P.-E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, Magnus, Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
Abstract: The cross section for the pd→3Heηπ0 reaction has been measured at a beam energy of 1450 MeV using the WASA detector at the CELSIUS storage ring and detecting one 3He and four photons from the decays of the two mesons. The data indicate that the production mechanism involves the formation of the Δ(1232) isobar. Although the beam energy does not allow the full peak of this resonance to be seen, the invariant masses of all three pairs of final particles are well reproduce dby a phase space Monte Carlo simulation weighted with the p-wave factor of the square of the π0 momentum in the 3He π0 system.
Published: 2010
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214. Production of eta and 3 pi mesons in the pd -> (HeX)-He-3 reaction at 1360 and 1450 MeV

Author: Schönning, Karin, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E, Engblom, P. Thorngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Schönning, Karin, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E, Engblom, P. Thorngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
Abstract: The cross-sections of the pd -> He-3 eta, pd -> He-3 pi(0)pi(0)pi(0) and pd -> He-3 pi(+)pi(-)pi(0) reactions have been measured at the beam kinetic energies T-p = 1360 MeV and T-p = 1450 MeV using the CELSIUS/WASA detector setup. At both energies, the differential cross-section d sigma/d Omega of the eta meson in the pd -> He-3 eta reaction shows a strong forward-backward asymmetry in the CMS. The ratio between the pd -> He-3 pi(+)pi(-)pi(0) and pd -> He-3 pi(0)pi(0)pi(0) cross-sections has been analysed in terms of isospin amplitudes. The reconstructed invariant-mass distributions of the pi pi, He-3 pi and (3)He2 pi systems provide hints on the role of nucleon resonances in the 3 pi production process.
Published: 2010
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215. Exclusive measurements of pp -> d pi(+)pi(0) : Double-pionic fusion without ABC effect

Author: Kren, F., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Ekström, Curt, Fransson, K., Greiff, J., Gustafsson, L., Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, S., Koch, I., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Ruber, R. J. M. Y., Schönning, Karin, Scobel, W., Skorodko, T., Shwartz, B., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Kren, F., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Ekström, Curt, Fransson, K., Greiff, J., Gustafsson, L., Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, S., Koch, I., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Ruber, R. J. M. Y., Schönning, Karin, Scobel, W., Skorodko, T., Shwartz, B., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: Exclusive measurements of the reaction pp -> d pi(+)pi(0) have been carried out at T-p = 1.1 GeV at the CELSIUS storage ring using the WASA detector. The isovector pi(+)pi(0) channel exhibits no enhancement at low invariant pi pi masses, i.e. no ABC effect. Therefore this most basic isovector double-pionic fusion reaction qualifies as an ideal test case for the conventional t-channel Delta Delta excitation process. Indeed, the obtained differential distributions reveal the conventional t-channel Delta Delta mechanism as the appropriate reaction process, which also accounts for the observed energy dependence of the total cross section.
Published: 2010
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216. eta-meson production in proton-proton collisions at excess energies of 40 and 72 MeV

Author: Petrén, Henrik, Bargholtz, Chr., Bashkanov, M., Bogoslavsky, D., Calén, Hans, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Fäldt, Göran, Gerén, L., Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S., Khakimova, O., Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Lindberg, K., Marciniewski, Pawel, Morosov, B., Pauly, C., Petukhov, Y., Povtorejko, A., Schönning, Karin, Scobel, W., Skorodko, T., Stepaniak, J., Tegner, P-E, Engblom, P. Thörngren, Tikhomirov, V., Wilkin, C., Wolke, Magnus, Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Petrén, Henrik, Bargholtz, Chr., Bashkanov, M., Bogoslavsky, D., Calén, Hans, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Fäldt, Göran, Gerén, L., Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S., Khakimova, O., Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Lindberg, K., Marciniewski, Pawel, Morosov, B., Pauly, C., Petukhov, Y., Povtorejko, A., Schönning, Karin, Scobel, W., Skorodko, T., Stepaniak, J., Tegner, P-E, Engblom, P. Thörngren, Tikhomirov, V., Wilkin, C., Wolke, Magnus, Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
Abstract: The production of eta mesons in proton-proton collisions has been studied using the WASA detector at the CELSIUS storage ring at excess energies of Q = 40 MeV and Q = 72 MeV. The eta was detected through its 2 gamma decay in a near-4 pi electromagnetic calorimeter, whereas the protons were measured by a combination of straw chambers and plastic scintillator planes in the forward hemisphere. About 6.9 x 10(4) and 9.3 x 10(4) events were found at Q = 40 MeV and Q = 72 MeV, respectively, with background contributions of less than 5%. A simple parametrization of the production cross section in terms of low partial waves was used to evaluate the acceptance corrections. Strong evidence was found for the influence of higher partial waves. The Dalitz plots show the presence of p waves in both the pp and the eta {pp} systems and the angular distributions of the eta in the center-of-mass frame suggest the influence of d-wave eta mesons.
Published: 2010
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217. Two-pion production in proton-proton collisions : experimental total cross sections and their isospin decomposition

Author: Skorodko, T, Bashkanov, M, Bogoslawsky, D, Calèn, Hans, Clement, H, Doroshkevich, E, Demiroers, L, Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G, Jacewicz, Marek, Jiganov, E, Johansson, Tord, Khakimova, O, Keleta, Samson, Koch, Inken, Kren, F, Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R, Morosov, B, Pauly, C, Petrén, Henrik, Petukhov, Y, Povtorejko, A, Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W, Shwartz, B, Stepaniak, J, Thörngren-Engblom, Pia, Tikhomirov, V, Wagner, G.J., Wolke, Magnus, Yamamoto, A, Zabierowski, J, Zlomanczuk, Jozef, Skorodko, T, Bashkanov, M, Bogoslawsky, D, Calèn, Hans, Clement, H, Doroshkevich, E, Demiroers, L, Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G, Jacewicz, Marek, Jiganov, E, Johansson, Tord, Khakimova, O, Keleta, Samson, Koch, Inken, Kren, F, Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Meier, R, Morosov, B, Pauly, C, Petrén, Henrik, Petukhov, Y, Povtorejko, A, Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W, Shwartz, B, Stepaniak, J, Thörngren-Engblom, Pia, Tikhomirov, V, Wagner, G.J., Wolke, Magnus, Yamamoto, A, Zabierowski, J, and Zlomanczuk, Jozef
Abstract: The two-pion production in pp-collisions has been investigated at CELSIUS in exclusive measurements from threshold up to T-P = 1.36 GeV. Total and differential Cross sections have been obtained for the channels pn pi(+)pi(0), pp pi(+)pi(-), pp pi(0)pi(0) and also nn pi(+)pi(+). For intermediate incident energies T-P > 1GeV, i.e. in the region which is beyond the Roper excitation but at the onset of Delta Delta excitation, the total pp pi(0)pi(0) cross section falls behind theoretical predictions by as much as all order of magnitude near 1.2 GeV, whereas the nn pi(+)pi(+) cross section is a factor of five larger than predicted. An isospin decomposition of the total cross sections exhibits a s-channel-like energy dependence in the region of the Roper excitation as well as a significant contribution of an isospin 3/2 resonance other than the Delta(1232). As possible candidates the Delta(1600) and the Delta(1700) are discussed. (C) 2009 Elsevier B.V. All rights reserved.
Published: 2009
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218. Production of the omega meson in the pd -> He-3 omega reaction at 1450 MeV and 1360 MeV

Author: Schönning, Karin, Bargholtz, Chr, Bashkanov, M, Berlowski, M, Bogoslawsky, D, Calen, H, Clement, H, Demiroers, L, Ekström, C, Fransson, K, Geren, L, Gustafsson, L, Hoistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Keleta, S, Khakimova, O, Khemchandani, P, Kren, F, Kullander, S, Kupsc, A, Kuzmin, A, Lindberg, K, Marciniewski, P, Morosov, B, Oelert, W, Pauly, C, Petrén, H, Petukhov, Y, Povtorejko, A, Ruber, R. J. M. Y., Scobel, W, Shafigullin, R, Shwartz, B, Skorodko, T, Sopov, V, Stepaniak, J, Tegner, P.-E., Thörngren Engblom, P, Tikhomirov, V, Turowiecki, A, Wagner, J, Wilkin, C, Wolke, M, Zabierowski, J, Zartova, I, Zlomanczuk, J, Schönning, Karin, Bargholtz, Chr, Bashkanov, M, Berlowski, M, Bogoslawsky, D, Calen, H, Clement, H, Demiroers, L, Ekström, C, Fransson, K, Geren, L, Gustafsson, L, Hoistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Keleta, S, Khakimova, O, Khemchandani, P, Kren, F, Kullander, S, Kupsc, A, Kuzmin, A, Lindberg, K, Marciniewski, P, Morosov, B, Oelert, W, Pauly, C, Petrén, H, Petukhov, Y, Povtorejko, A, Ruber, R. J. M. Y., Scobel, W, Shafigullin, R, Shwartz, B, Skorodko, T, Sopov, V, Stepaniak, J, Tegner, P.-E., Thörngren Engblom, P, Tikhomirov, V, Turowiecki, A, Wagner, J, Wilkin, C, Wolke, M, Zabierowski, J, Zartova, I, and Zlomanczuk, J
Abstract: The production of omega mesons in the pd -> He-3 omega reaction has been studied at two energies near the kinematic threshold, T-p = 1450 MeV and T-p = 1360 MeV. The differential cross section was measured as a function of the omega c.m. angle at both energies over the whole angular range. Whereas the results at 1360 MeV are consistent with isotropy, strong rises are observed near both the forward and backward directions at 1450 MeV. Calculations made using a two-step model with an intermediate pion fail to reproduce the shapes of the measured angular distributions and also underestimate the total cross sections.
Published: 2009
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219. Exclusive measurement of two-pion production in the dd -> He-4 pi pi reaction

Author: Keleta, S, Bargholtz, Chr, Bashkanov, M, Berlowski, M, Bogoslawsky, D, Calèn, H, Clement, H, Demirors, L, Ekström, C, Fransson, K, Geren, L, Gustafsson, L, Hoistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Khakimova, O, Kren, F, Kullander, S, Kupsc, A, Kuzmin, A, Lindberg, K, Marciniewski, P, Morosov, B, Oelert, W, Pauly, C, Petrèn, H, Petukhov, Y, Povtorejko, A, Pricking, A, Ruber, R. J. M. Y., Schönning, K, Scobel, W, Shafigullin, R, Shwartz, B, Skorodko, T, Sopov, V, Stepaniak, J, Tegner, P.-E., Engblom, Thorngren, Tikhomirov, V, Turowiecki, A, Wagner, J, Wilkin, C, Wolke, M, Zabierowski, J, Zartova, I, Zlomanczuk, J, Keleta, S, Bargholtz, Chr, Bashkanov, M, Berlowski, M, Bogoslawsky, D, Calèn, H, Clement, H, Demirors, L, Ekström, C, Fransson, K, Geren, L, Gustafsson, L, Hoistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Khakimova, O, Kren, F, Kullander, S, Kupsc, A, Kuzmin, A, Lindberg, K, Marciniewski, P, Morosov, B, Oelert, W, Pauly, C, Petrèn, H, Petukhov, Y, Povtorejko, A, Pricking, A, Ruber, R. J. M. Y., Schönning, K, Scobel, W, Shafigullin, R, Shwartz, B, Skorodko, T, Sopov, V, Stepaniak, J, Tegner, P.-E., Engblom, Thorngren, Tikhomirov, V, Turowiecki, A, Wagner, J, Wilkin, C, Wolke, M, Zabierowski, J, Zartova, I, and Zlomanczuk, J
Abstract: The results from the first kinematically complete measurement of the dd -> He-4 pi pi reaction are reported. The aim was to investigate a long standing puzzle regarding the origin of the peculiar pi pi-invariant mass distributions appearing in double pion production in light ion collisions, the so-called ABC effect. The measurements were performed at the incident deuteron energies of 712 MeV and 1029 MeV. with the WASA detector assembly at CELSIUS in Uppsala, Sweden. We report the observation of a characteristic enhancement at low pi pi-invariant mass at 712 MeV, the lowest energy yet. At the higher energy, in addition to confirming previous experimental observations, Our results reveal a strong angular dependence of the pions in the overall centre of mass system. The results are qualitatively reproduced by a theoretical model, according to which the ABC effect is described as resulting from a kinematical enhancement in the production of the pion pairs from two parallel and independent NN -> d pi sub-processes. (C) 2009 Elsevier B.V. All rights reserved.
Published: 2009
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220. Double-Pionic Fusion of Nuclear Systems and the 'ABC' Effect : Approaching a Puzzle by Exclusive and Kinematically Complete Measurements

Author: Bashkanov, M., Bargholtz, C., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Doroshkevich, E., Duniec, David, Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, Samson, Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E, Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Bashkanov, M., Bargholtz, C., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Doroshkevich, E., Duniec, David, Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Keleta, Samson, Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E, Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
Abstract: The ABC effect-a puzzling low-mass enhancement in the pi pi invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on the first exclusive and kinematically complete measurements of the most basic double-pionic fusion reaction pn -> d pi(0)pi(0) at beam energies of 1.03 and 1.35 GeV. The measurements, which have been carried out at CELSIUS-WASA, reveal the ABC effect to be a (pi pi)(I=L=0) channel phenomenon associated with both a resonancelike energy dependence in the integral cross section and the formation of a Delta Delta system in the intermediate state. A corresponding simple s-channel resonance ansatz provides a surprisingly good description of the data.
Published: 2009
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221. eta PRODUCTION IN PROTON-PROTON COLLISIONS AT 72 MeV EXCESS ENERGY

Author: Pettersson, Henrik, Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Ekstrom, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Pettersson, Henrik, Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Ekstrom, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: The production of eta mesons at an excess energy of 72 MeV has been studied in the reaction pp -> pp(eta)gamma gamma. It is shown that a simple model with Pp. final states included reproduces observed differential distributions better than the same model restricted to Ss, Sd and Ds final states. The strong influence of the Pp states could be taken as an indication of rho dominance within an one boson exchange model for the excitation of N*(1535).
Published: 2009
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222. THE pp -> d pi(+)pi(0) REACTION - A CASE OF Delta Delta EXCITATION WITHOUT ABC-EFFECT

Author: Kren, F., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E, Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Kren, F., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E, Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: The ABC effect, a low-mass enhancement in the invariant pp mass, is observed in double-pionic fusion reactions leading to a bound nuclear system in the final state. From previous measurements there have been indications that this phenomenon is resctricted to the sigma channel of the pp system. With exclusive measurements of the pp -> d pi(+)pi(0) reaction at T-p = 1.1 GeV we demonstrate that, indeed, the ABC effect does not occur in the vector-isovector Delta Delta channel (rho channel) despite the fact that the Delta Delta excitation is oberved to be the dominant reaction process. We also show that this reaction is well described by a t-channel Delta Delta excitation with the subsequent decay into the vector-isovector Delta Delta channel given by the rho channel operator.
Published: 2009
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223. ISOSPIN DECOMPOSITION OF pp -> NN pi pi CROSS SECTIONS : DO WE SEE A SIGN OF Delta(1600) EXCITATION IN THE nn pi(+)pi(+) CHANNEL?

Author: Skorodko, T., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepaniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Skorodko, T., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepaniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: The two-pion production in pp-collisions has been investigated in exclusive measurements from threshold up to T-p = 1.36 GeV. Total and differential cross sections have been obtained for the channels pn pi(+) pi(0), pp pi(+) pi(-), pp pi(0)pi(0) and also nn pi(+)pi(+). For intermediate incident energies T-p > 1 GeV, i.e. in the region, which is beyond the Roper excitation but at the onset of Delta Delta excitation the total pp pi(0)pi(0) cross section falls behind theoretical predictions by as much as an order of magnitude near 1.2 GeV, whereas the nn pi(+)pi(+) cross section is a factor of five larger than predicted. A model-unconstrained isospin decompostion of the cross section points to a significant contribution of an isospin 3/2 resonance other than the Delta(1232). As a possible candidate the Delta(1600) is discussed.
Published: 2009
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224. Polarisation of the omega meson in the pd -> He-3 omega reaction at 1360 and 1450 MeV

Author: Schönning, Karin, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Schönning, Karin, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimova, O., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
Abstract: The tensor polarisation of omega mesons produced in the pd -> He-3 omega reaction has been studied at two energies near threshold. The 3 He nuclei were detected in coincidence with the pi(0)pi(+)pi(-) or pi(0)gamma decay products of the omega. in contrast to the case of phi-meson production, the omega mesons are found to be unpolarised. This brings into question the applicability of the Okubo-Zweig-lizuka rule when comparing the production of vector mesons in low energy hadronic reactions.
Published: 2008
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225. The WASA detector facility at CELSIUS

Author: Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bondar, A., Bogoslawsky, D., Brodowski, W., Brudvik, J., Calén, Hans, Capellaro, Filippo, Chilingarov, A., Clement, H., Comfort, J., Demiroers, L., Ekström, Curt, Fransson, Kjell, Fridén, Carl-Johan, Geren, L., Gornov, M., Grebenev, V., Greiff, J., Gurov, Y., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, A., Johansson, Tord, Keleta, S., Khakimova, O., Khoukaz, A., Kilian, K., Kimura, N., Koch, I., Kolachev, G., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Kuznetsov, A., Lindberg, K., Marciniewski, Pawel, Meier, R., Messner, O., Morosov, B., Nawrot, A., Nefkens, B. M. K., Norman, G., Oelert, W., Pauly, C., Pettersson, H., Pivovarov, A., Patzold, J., Petukhov, Y., Povtorejko, A., Reistad, Dag, Ruber, Roger J. M. Y., Sandukovsky, S., Schönning, Karin, Scobel, W., Sefzick, T., Shafigullin, R., Shwartz, B., Sidorov, V., Skorodko, T., Sopov, V., Starostin, A., Stepaniak, J., Sukhanov, A., Tchernyshev, V., Tegner, P-E, Engblom, P. Thorngren, Tikhomirov, V., Toki, H., Turowiecki, A., Wagner, G. J., Wiedner, Ulrich, Wilhelmi, Z., Wolke, M., Yamamoto, A., Yamaoka, H., Zabierowski, J., Zartova, I., Zlomanczuk, Josef, Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bondar, A., Bogoslawsky, D., Brodowski, W., Brudvik, J., Calén, Hans, Capellaro, Filippo, Chilingarov, A., Clement, H., Comfort, J., Demiroers, L., Ekström, Curt, Fransson, Kjell, Fridén, Carl-Johan, Geren, L., Gornov, M., Grebenev, V., Greiff, J., Gurov, Y., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, A., Johansson, Tord, Keleta, S., Khakimova, O., Khoukaz, A., Kilian, K., Kimura, N., Koch, I., Kolachev, G., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Kuznetsov, A., Lindberg, K., Marciniewski, Pawel, Meier, R., Messner, O., Morosov, B., Nawrot, A., Nefkens, B. M. K., Norman, G., Oelert, W., Pauly, C., Pettersson, H., Pivovarov, A., Patzold, J., Petukhov, Y., Povtorejko, A., Reistad, Dag, Ruber, Roger J. M. Y., Sandukovsky, S., Schönning, Karin, Scobel, W., Sefzick, T., Shafigullin, R., Shwartz, B., Sidorov, V., Skorodko, T., Sopov, V., Starostin, A., Stepaniak, J., Sukhanov, A., Tchernyshev, V., Tegner, P-E, Engblom, P. Thorngren, Tikhomirov, V., Toki, H., Turowiecki, A., Wagner, G. J., Wiedner, Ulrich, Wilhelmi, Z., Wolke, M., Yamamoto, A., Yamaoka, H., Zabierowski, J., Zartova, I., and Zlomanczuk, Josef
Abstract: The WASA 4 pi 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 unique feature of the system is the use of hydrogen pellets as internal targets for the first time. A detailed description of the design, together with the anticipated and achieved performance parameters are given. (C) 2008 Elsevier B.V. All rights reserved.
Published: 2008
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226. Measurement of eta meson decays into lepton-antilepton pairs

Author: Berlowski, M., Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Bondar, A., Calén, Hans, Cappellaro, Filippo, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Berlowski, M., Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Bondar, A., Calén, Hans, Cappellaro, Filippo, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
Abstract: A search for rare lepton decays of the eta meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay eta -> e(+)e(-)e(+)e(-) events are reported with a background of 1.3 +/- 0.2 events. This allows to set an upper limit to the branching ratio of 9.7x10(-5) (90% CL). The branching ratio for the decay eta -> e(+)e(-)gamma is determined to (7.8 +/- 0.5(stat)+/- 0.8(syst))x10(-3) in agreement with world average value. An upper limit (90% CL) for the branching ratio for the eta -> e(+)e(-) decay is 2.7x10(-5) and a limit for the sum of the eta ->mu(+)mu(-)mu(+)mu(-) and eta ->pi(+)pi(-)mu(+)mu(-) decays is 3.6x10(-4).
Published: 2008
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227. Excitation of the Roper resonance in single- and double-pion production in nucleon-nucleon collisions

Author: Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Cappellaro, Filippo, Clement, H., Demiroers, L., Doroshkevich, E., Duniec, David, Ekström, Curt, Franssen, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Kaskulov, M., Keleta, S., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, Henrik, Petukhov, Y., Povtorejko, A., Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepeniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Cappellaro, Filippo, Clement, H., Demiroers, L., Doroshkevich, E., Duniec, David, Ekström, Curt, Franssen, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Kaskulov, M., Keleta, S., Koch, Inken, Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, Henrik, Petukhov, Y., Povtorejko, A., Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepeniak, J., Thörngren-Engblom, Pia, Tikhomirov, V., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
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 n pi(+) mass spectrum of the pp -> np pi(+) reaction at M approximate to 1360 MeV with a width of approximate to 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 -> pp pi(0)pi(0) , where the Roper excitation and its subsequent decays via the routes N* -> Delta pi -> N pi pi and N* -> N sigma are the only dominant processes, we find its direct decay into the N sigma channel to be the by far dominating decay process -in favor of a monopole excitation of the Roper resonance.
Published: 2008
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228. Measurement of thepn→ppπ0π−reaction in search for the recently observed resonance structure indπ0π0anddπ+π−systems

Author: Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bergmann, F. S., additional, Berłowski, M., additional, Bhatt, H., additional, Büscher, M., additional, Calén, H., additional, Ciepał, I., additional, Clement, H., additional, Coderre, D., additional, Czerwiński, E., additional, Demmich, K., additional, Doroshkevich, E., additional, Engels, R., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goslawski, P., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Hauenstein, F., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hinterberger, F., additional, Hodana, M., additional, Höistad, B., additional, Jany, A., additional, Jany, B. R., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khan, F. A., additional, Khoukaz, A., additional, Kirillov, D. A., additional, Kistryn, S., additional, Klaja, J., additional, Kleines, H., additional, Kłos, B., additional, Krapp, M., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Lalwani, K., additional, Lersch, D., additional, Li, L., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Mikirtychiants, M., additional, Morsch, H.-P., additional, Moskal, P., additional, Nandi, B. K., additional, Ohm, H., additional, Ozerianska, I., additional, Perez del Rio, E., additional, Piskunov, N. M., additional, Pluciński, P., additional, Podkopał, P., additional, Prasuhn, D., additional, Pricking, A., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Redmer, C. F., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Sawant, S., additional, Schmidt, A., additional, Schadmand, S., additional, Sefzick, T., additional, Serdyuk, V., additional, Shah, N., additional, Siemaszko, M., additional, Siudak, R., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Tolba, T., additional, Trzciński, A., additional, Varma, R., additional, Wagner, G. J., additional, Węglorz, W., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Wurm, P., additional, Yamamoto, A., additional, Yuan, X., additional, Zabierowski, J., additional, Zheng, C., additional, Zieliński, M. J., additional, Zipper, W., additional, Złomańczuk, J., additional, Żuprański, P., additional, and Żurek, M., additional
Published: 2013
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229. Search for a dark photon in the π0→e+e−γ decay

Author: Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bergmann, F.S., additional, Berłowski, M., additional, Bhatt, H., additional, Bondar, A., additional, Büscher, M., additional, Calén, H., additional, Ciepał, I., additional, Clement, H., additional, Coderre, D., additional, Czerwiński, E., additional, Demmich, K., additional, Doroshkevich, E., additional, Engels, R., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goslawski, P., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Hauenstein, F., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hinterberger, F., additional, Hodana, M., additional, Höistad, B., additional, Jany, A., additional, Jany, B.R., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khan, F.A., additional, Khoukaz, A., additional, Kistryn, S., additional, Klaja, J., additional, Kleines, H., additional, Kirillov, D.A., additional, Kłos, B., additional, Krapp, M., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Kuzmin, A., additional, Lalwani, K., additional, Lersch, D., additional, Li, L., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Meißner, U.-G., additional, Mikirtychiants, M., additional, Morsch, H.-P., additional, Moskal, P., additional, Nandi, B.K., additional, Ohm, H., additional, Ozerianska, I., additional, Perez del Rio, E., additional, Piskunov, N.M., additional, Pluciński, P., additional, Podkopał, P., additional, Prasuhn, D., additional, Pricking, A., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Redmer, C.F., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Sawant, S., additional, Schadmand, S., additional, Schmidt, A., additional, Sefzick, T., additional, Serdyuk, V., additional, Shah, N., additional, Shwartz, B., additional, Siemaszko, M., additional, Siudak, R., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Tolba, T., additional, Trzciński, A., additional, Varma, R., additional, Wagner, G.J., additional, Wȩglorz, W., additional, Wirzba, A., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Wurm, P., additional, Yamamoto, A., additional, Zabierowski, J., additional, Zieliński, M.J., additional, Zipper, W., additional, Złomańczuk, J., additional, Żuprański, P., additional, and Żurek, M., additional
Published: 2013
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230. Investigation of thedd→3Henπ0reaction with the FZ Jülich WASA-at-COSY facility

Author: Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bergmann, F. S., additional, Berłowski, M., additional, Bhatt, H., additional, Büscher, M., additional, Calén, H., additional, Ciepał, I., additional, Clement, H., additional, Coderre, D., additional, Czerwiński, E., additional, Demmich, K., additional, Doroshkevich, E., additional, Engels, R., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goslawski, P., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Hanhart, C., additional, Hauenstein, F., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hinterberger, F., additional, Hodana, M., additional, Höistad, B., additional, Jany, A., additional, Jany, B. R., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khan, F. A., additional, Khoukaz, A., additional, Kirillov, D. A., additional, Kistryn, S., additional, Klaja, J., additional, Kleines, H., additional, Kłos, B., additional, Krapp, M., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Lalwani, K., additional, Lersch, D., additional, Li, L., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Mikirtychiants, M., additional, Morsch, H.-P., additional, Moskal, P., additional, Nandi, B. K., additional, Ohm, H., additional, Ozerianska, I., additional, Perez del Rio, E., additional, Piskunov, N. M., additional, Pluciński, P., additional, Podkopał, P., additional, Prasuhn, D., additional, Pricking, A., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Redmer, C. F., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Sawant, S., additional, Schmidt, A., additional, Schadmand, S., additional, Sefzick, T., additional, Serdyuk, V., additional, Shah, N., additional, Siemaszko, M., additional, Siudak, R., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Tolba, T., additional, Trzciński, A., additional, Varma, R., additional, Wagner, G. J., additional, Węglorz, W., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Wurm, P., additional, Yamamoto, A., additional, Yuan, X., additional, Zabierowski, J., additional, Zheng, C., additional, Zieliński, M. J., additional, Zipper, W., additional, Złomańczuk, J., additional, Żuprański, P., additional, and Żurek, M., additional
Published: 2013
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231. Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect

Author: Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bednarski, T., additional, Bergmann, F.S., additional, Berłowski, M., additional, Bhatt, H., additional, Büscher, M., additional, Calén, H., additional, Clement, H., additional, Coderre, D., additional, Czerwiński, E., additional, Demmich, K., additional, Doroshkevich, E., additional, Engels, R., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goslawski, P., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Hauenstein, F., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hinterberger, F., additional, Hodana, M., additional, Höistad, B., additional, Jany, A., additional, Jany, B.R., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khan, F.A., additional, Khoukaz, A., additional, Kistryn, S., additional, Klaja, J., additional, Kleines, H., additional, Kłos, B., additional, Krapp, M., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Lalwani, K., additional, Lersch, D., additional, Li, L., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Mikirtychiants, M., additional, Morsch, H.-P., additional, Moskal, P., additional, Nandi, B.K., additional, Niedźwiecki, S., additional, Ohm, H., additional, Ozerianska, I., additional, Perez del Rio, E., additional, Pluciński, P., additional, Podkopał, P., additional, Prasuhn, D., additional, Pricking, A., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Redmer, C.F., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Sawant, S., additional, Schadmand, S., additional, Schmidt, A., additional, Sefzick, T., additional, Serdyuk, V., additional, Shah, N., additional, Siemaszko, M., additional, Siudak, R., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Tolba, T., additional, Trzciński, A., additional, Varma, R., additional, Vlasov, P., additional, Wagner, G.J., additional, Węglorz, W., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Wurm, P., additional, Yamamoto, A., additional, Yuan, X., additional, Yurev, L., additional, Zabierowski, J., additional, Zheng, C., additional, Zieliński, M.J., additional, Zipper, W., additional, Złomańczuk, J., additional, Żuprański, P., additional, and Żurek, M., additional
Published: 2013
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232. Search forη-mesic4He with the WASA-at-COSY detector

Author: Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bednarski, T., additional, Bergmann, F. S., additional, Berłowski, M., additional, Bhatt, H., additional, Büscher, M., additional, Calén, H., additional, Clement, H., additional, Coderre, D., additional, Czerwiński, E., additional, Demmich, K., additional, Doroshkevich, E., additional, Engels, R., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goslawski, P., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.–O., additional, Hauenstein, F., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hinterberger, F., additional, Hodana, M., additional, Höistad, B., additional, Jany, A., additional, Jany, B. R., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khan, F. A., additional, Khoukaz, A., additional, Kistryn, S., additional, Klaja, J., additional, Kleines, H., additional, Kłos, B., additional, Krapp, M., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Lalwani, K., additional, Lersch, D., additional, Li, L., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Mikirtychiants, M., additional, Morsch, H.–P., additional, Moskal, P., additional, Nandi, B. K., additional, Niedźwiecki, S., additional, Ohm, H., additional, Ozerianska, I., additional, Perez del Rio, E., additional, Pluciński, P., additional, Podkopał, P., additional, Prasuhn, D., additional, Pricking, A., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Redmer, C. F., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Sawant, S., additional, Schadmand, S., additional, Schmidt, A., additional, Sefzick, T., additional, Serdyuk, V., additional, Shah, N., additional, Siemaszko, M., additional, Siudak, R., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Tolba, T., additional, Trzciński, A., additional, Varma, R., additional, Vlasov, P., additional, Wagner, G. J., additional, Węglorz, W., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Wurm, P., additional, Yamamoto, A., additional, Yuan, X., additional, Yurev, L., additional, Zabierowski, J., additional, Zheng, C., additional, Zieliński, M. J., additional, Zipper, W., additional, Złomańczuk, J., additional, Żuprański, P., additional, and Żurek, M., additional
Published: 2013
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233. Measurement of the eta -> pi(+)pi(-)e(+)e(-) decay branching ratio

Author: Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Cappellaro, F., Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell E., Gerén, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S. Negasi, Koch, I., Kullander, Sven O., Kupsc, Andrzej, Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, Hanna I., Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Tegner, P. -E, Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Cappellaro, F., Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell E., Gerén, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S. Negasi, Koch, I., Kullander, Sven O., Kupsc, Andrzej, Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, Hanna I., Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Tegner, P. -E, Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef
Abstract: The reaction pd -> He-3 eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta -> pi(+)pi(-)e(+)e(-) is measured to be (4.3 +/- 1.3 +/- 0.4) x 10(-4).
Published: 2007
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234. Anisotropy in the pion angular distribution of the reaction pp -> pp pi(0) at 400 MeV

Author: Thörngren Engblom, Pia, Keleta, S. Negasi, Cappellaro, F., Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Koch, I., Kullander, Sven, Pettersson, Hanna, Schönning, Karin, Zlomanczuk, Jozef, Calén, Hans, Fransson, Kjell, Kupsc, Andrzej, Marciniewski, Pawel, Wolke, Magnus, Pauly, C., Demiroers, L., Scobel, W., Stepaniak, J., Zabierowski, J., Bashkanov, M., Clement, H., Khakimova, O., Kren, F., Skorodko, T., Thörngren Engblom, Pia, Keleta, S. Negasi, Cappellaro, F., Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Koch, I., Kullander, Sven, Pettersson, Hanna, Schönning, Karin, Zlomanczuk, Jozef, Calén, Hans, Fransson, Kjell, Kupsc, Andrzej, Marciniewski, Pawel, Wolke, Magnus, Pauly, C., Demiroers, L., Scobel, W., Stepaniak, J., Zabierowski, J., Bashkanov, M., Clement, H., Khakimova, O., Kren, F., and Skorodko, T.
Abstract: The reaction pp -> pp pi(0) was studied with the WASA detector at the CELSIUS storage ring. The center of mass angular distribution of the pi(0) was obtained by detection of the gamma decay products together with the two outgoing protons and found to be anisotropic with a negative second derivative slope, in agreement with the theoretical predictions from a microscopic calculation.
Published: 2007
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235. pi pi production in proton-proton collisions

Author: Skorodko, T., Calèn, Hans, Cappellaro, F., Ekström, Curt, Fransson, Kjell, Greiff, Jan, Gustafsson, Leif, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Keleta, Samson, Koch, I., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Ruber, Roger, Thörngren-Engblom, Pia, Wolke, Magnus, Zlomanczuk, Jozef, Skorodko, T., Calèn, Hans, Cappellaro, F., Ekström, Curt, Fransson, Kjell, Greiff, Jan, Gustafsson, Leif, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Keleta, Samson, Koch, I., Kullander, Sven, Kupsc, Andrzej, Marciniewski, Pawel, Ruber, Roger, Thörngren-Engblom, Pia, Wolke, Magnus, and Zlomanczuk, Jozef
Abstract: At CELSIUS-WASA the two-pion production in proton-proton collisisons has been measured exclusively from threshold up to the energy regime, where both of the collision partners are expected to be excited to the Δ state. The measurements constitute the first kinematically complete data samples of solid statistics in this energy range. Most of the data have been obtained for the π+π- and π0π0channels. Whereas at near-threshold energies the differential distributions can be succesfully explained by chiral dynamics and Roper excitation, respectively, the data for the π+π- channel in the ΔΔ region can be described only, if the special configuration (ΔΔ)0+ is assumed. The data for the π0π0 channel moreover exhibit a low-mass enhancement in the π0π0 invariant mass spectrum, which is reminiscent of the ABC-effect found in double-pionic fusion to light nuclei.
Published: 2007
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236. The pp→ppπππ reaction channels in the threshold region

Author: Pauly, C., Jacewicz, Marek, Koch, Inken, Bashkanov, M., Bogoslawsky, D., Calén, Hans, Capellaro, Filippo, Clement, H., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jiganov, E., Johansson, Tord, Keleta, Samson, Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Petukhov, Y., Pettersson, Henrik, Povtorejko, A., Ruber, Roger J.M.Y, Schönning, Karin, Scobel, W., Skorodko, T., Shwartz, B., Sopov, V., Stepaniak, J., Tchernyshev, V., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wiedner, Ulrich, Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Pauly, C., Jacewicz, Marek, Koch, Inken, Bashkanov, M., Bogoslawsky, D., Calén, Hans, Capellaro, Filippo, Clement, H., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jiganov, E., Johansson, Tord, Keleta, Samson, Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Petukhov, Y., Pettersson, Henrik, Povtorejko, A., Ruber, Roger J.M.Y, Schönning, Karin, Scobel, W., Skorodko, T., Shwartz, B., Sopov, V., Stepaniak, J., Tchernyshev, V., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wiedner, Ulrich, Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: The cross section for direct neutral and charged three pion production in pp interactions was measured at excess energies in the range 160–216 MeV. That comprises the first measurement of the pp→ppπ0π0π0 reaction and the direct comparison with the pp→ppπ+π−π0 process. The experiment was performed above the η meson production threshold and the cross section could be directly normalized to the cross section of the pp→ppη reaction, with the η decaying into 3 pions. Since the same final states are selected, the measurement has a low systematical error. The measured cross section ratio σ(pp→ppπ+π−π0)/σ(pp→ppπ0π0π0) is compared to predictions of dominance of different isobars in the intermediate state.
Published: 2007
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237. Measurement of the slope parameter for the η → 3π0 decay in the pp → ppη reaction

Author: Bashkanov, M., Bogoslawsky, D., Calén, Hans, Capellaro, Filippo, Clement, H., Demirörs, L., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Petukhov, Y., Pettersson, Henrik, Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Skorodko, T., Shwartz, B., Sopov, V., Stepaniak, J., Tchernyshev, V., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wiedner, Ulrich, Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Bashkanov, M., Bogoslawsky, D., Calén, Hans, Capellaro, Filippo, Clement, H., Demirörs, L., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Petukhov, Y., Pettersson, Henrik, Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Skorodko, T., Shwartz, B., Sopov, V., Stepaniak, J., Tchernyshev, V., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wiedner, Ulrich, Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: The CELSIUS-WASA setup is used to measure the 3π0 decay of η mesons produced in pp interactions with beam kinetic energies of 1.36 and 1.45 GeV. The efficiency-corrected Dalitz plot and density distributions for this decay are shown, together with a fit of the quadratic slope parameter α yielding α = −0.026 ± 0.010(stat) ± 0.010(syst). This value is compared to recent experimental results and theoretical predictions.
Published: 2007
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238. Exclusive measurements of pd -> He-3 pi pi : The ABC effect revisited

Author: Bashkanov, M., Bogoslawsky, D., Calén, Hans, Cappellaro, F., Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Greiff, J., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Kaskulov, M. M., Keleta, Samson, Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Petukho, Y., Povtorejko, A., Ruber, Roger, Scobel, W., Skorodko, T., Shwartz, B., Sopov, V., Stepaniak, J., Tchernyshev, V., Thorngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Bashkanov, M., Bogoslawsky, D., Calén, Hans, Cappellaro, F., Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Greiff, J., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Khakimova, O., Kaskulov, M. M., Keleta, Samson, Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Petukho, Y., Povtorejko, A., Ruber, Roger, Scobel, W., Skorodko, T., Shwartz, B., Sopov, V., Stepaniak, J., Tchernyshev, V., Thorngren-Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef
Abstract: Exclusive measurements of the reactions pd -> He-3 pi(+)7 pi(-) and pd -> He-3 pi(0)pi(0) have been carried out at T-p = 0.893 GeV at the CELSIUS storage ring using the WASA detector. The pi(+)pi(-) channel evidences a pronounced enhancement at low invariant pi pi masses-as anticipated from previous inclusive measurements of the ABC effect. This enhancement is seen to be even much larger in the isoscalar pi(0)pi(0) channel. The differential distributions prove this enhancement to be of scalar-isoscalar nature. Delta Delta calculations give a good description of the data, if a boundstate condition is imposed for the intermediate Delta Delta system.
Published: 2006
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239. Abashian-Booth-Crowe resonance structure in the double pionic fusion to4He

Author: Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bednarski, T., additional, Bergmann, F. S., additional, Berłowski, M., additional, Bhatt, H., additional, Brinkmann, K.-T., additional, Büscher, M., additional, Calén, H., additional, Clement, H., additional, Coderre, D., additional, Czerwiński, E., additional, Demmich, K., additional, Doroshkevich, E., additional, Engels, R., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goslawski, P., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Hauenstein, F., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hinterberger, F., additional, Hodana, M., additional, Höistad, B., additional, Husmann, C., additional, Jany, A., additional, Jany, B. R., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khan, F. A., additional, Khoukaz, A., additional, Kistryn, S., additional, Klaja, J., additional, Kleines, H., additional, Kłos, B., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Lalwani, K., additional, Lersch, D., additional, Li, L., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Mikirtychiants, M., additional, Morsch, H.-P., additional, Moskal, P., additional, Nandi, B. K., additional, Niedźwiecki, S., additional, Ohm, H., additional, Ozerianska, I., additional, Pauly, C., additional, Perez del Rio, E., additional, Petukhov, Y., additional, Pluciński, P., additional, Podkopał, P., additional, Prasuhn, D., additional, Pricking, A., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Redmer, C. F., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Sawant, S., additional, Schadmand, S., additional, Schmidt, A., additional, Serdyuk, V., additional, Shah, N., additional, Siudak, R., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Tolba, T., additional, Trzciński, A., additional, Varma, R., additional, Vlasov, P., additional, Wagner, G. J., additional, Węglorz, W., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Wurm, P., additional, Yamamoto, A., additional, Yuan, X., additional, Yurev, L., additional, Zabierowski, J., additional, Zheng, C., additional, Zieliński, M. J., additional, Zipper, W., additional, Złomańczuk, J., additional, and Żuprański, P., additional
Published: 2012
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240. ABC Effect and Resonance Structure in the Double-Pionic Fusion to3He

Author: Perez del Rio, E., primary, Bashkanov, M., additional, Clement, H., additional, Doroshkevich, E., additional, Pricking, A., additional, Skorodko, T., additional, and Wagner, G. J., additional
Published: 2012
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241. Exclusive measurement of the η→π+π−γ decay

Author: Adlarson, P., primary, Adolph, C., additional, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bednarski, T., additional, Bergmann, F.S., additional, Berłowski, M., additional, Bhatt, H., additional, Brinkmann, K.-T., additional, Büscher, M., additional, Calén, H., additional, Clement, H., additional, Coderre, D., additional, Czerwiński, E., additional, Doroshkevich, E., additional, Engels, R., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goslawski, P., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Hanhart, C., additional, Heijkenskjöld, L., additional, Heimlich, J., additional, Hejny, V., additional, Hinterberger, F., additional, Hodana, M., additional, Höistad, B., additional, Jacewicz, M., additional, Jany, A., additional, Jany, B.R., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khakimova, O., additional, Khoukaz, A., additional, Kistryn, S., additional, Klaja, J., additional, Kleines, H., additional, Kłos, B., additional, Kren, F., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Lalwani, K., additional, Leupold, S., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Mariański, B., additional, Marciniewski, P., additional, Meißner, U.-G., additional, Mikirtychiants, M., additional, Morsch, H.-P., additional, Moskal, P., additional, Nandi, B.K., additional, Niedźwiecki, S., additional, Ohm, H., additional, Passfeld, A., additional, Pauly, C., additional, Perez del Rio, E., additional, Petri, T., additional, Petukhov, Y., additional, Piskunov, N., additional, Pluciński, P., additional, Podkopał, P., additional, Povtoreyko, A., additional, Prasuhn, D., additional, Pricking, A., additional, Pysz, K., additional, Pyszniak, A., additional, Rausmann, T., additional, Redmer, C.F., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Sawant, S., additional, Schadmand, S., additional, Schmidt, A., additional, Sefzick, T., additional, Serdyuk, V., additional, Shah, N., additional, Siemaszko, M., additional, Siudak, R., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Stollenwerk, F., additional, Ströher, H., additional, Szczurek, A., additional, Täschner, A., additional, Terschlüsen, C., additional, Tolba, T., additional, Trzciński, A., additional, Varma, R., additional, Vlasov, P., additional, Wagner, G.J., additional, Węglorz, W., additional, Winnemöller, A., additional, Wirzba, A., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Wurm, P., additional, Yuan, X., additional, Yurev, L., additional, Zabierowski, J., additional, Zheng, C., additional, Zieliński, M.J., additional, Zipper, W., additional, Złomańczuk, J., additional, and Żuprański, P., additional
Published: 2012
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242. π0π0 Production in proton–proton collisions at Tp=1.4 GeV

Author: Adlarson, P., primary, Adolph, C., additional, Augustyniak, W., additional, Bashkanov, M., additional, Bednarski, T., additional, Bergmann, F.S., additional, Berłowski, M., additional, Bhatt, H., additional, Brinkmann, K.-T., additional, Büscher, M., additional, Calén, H., additional, Clement, H., additional, Coderre, D., additional, Czerwiński, E., additional, Doroshkevich, E., additional, Engels, R., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goslawski, P., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Heijkenskjöld, L., additional, Heimlich, J., additional, Hejny, V., additional, Hinterberger, F., additional, Hodana, M., additional, Höistad, B., additional, Jacewicz, M., additional, Janusz, M., additional, Jany, A., additional, Jany, B.R., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khakimova, O., additional, Khoukaz, A., additional, Kistryn, S., additional, Klaja, J., additional, Kleines, H., additional, Kłos, B., additional, Kren, F., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Lalwani, K., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Mariański, B., additional, Marciniewski, P., additional, Mikirtychiants, M., additional, Morsch, H.-P., additional, Moskal, P., additional, Nandi, B.K., additional, Niedźwiecki, S., additional, Ohm, H., additional, Passfeld, A., additional, Pauly, C., additional, Perez del Rio, E., additional, Petukhov, Y., additional, Piskunov, N., additional, Pluciński, P., additional, Podkopał, P., additional, Povtoreyko, A., additional, Prasuhn, D., additional, Pricking, A., additional, Pysz, K., additional, Rausmann, T., additional, Redmer, C.F., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Sawant, S., additional, Schadmand, S., additional, Schmidt, A., additional, Sefzick, T., additional, Serdyuk, V., additional, Shah, N., additional, Siemaszko, M., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Täschner, A., additional, Tolba, T., additional, Trzciński, A., additional, Varma, R., additional, Vlasov, P., additional, Wagner, G.J., additional, Węglorz, W., additional, Wiedner, U., additional, Winnemöller, A., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Wurm, P., additional, Yuan, X., additional, Yurev, L., additional, Zabierowski, J., additional, Zheng, C., additional, Zieliński, M.J., additional, Zipper, W., additional, Złomańczuk, J., additional, and Żuprański, P., additional
Published: 2012
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243. ABC Effect in Double-Pionic Fusion – a New Resonance?

Author: Pricking, A., primary, Bashkanov, M., additional, Clement, H., additional, Doroshkevich, E., additional, Perez del Rio, E., additional, Skorodko, T., additional, and Wagner, G. J., additional
Published: 2012
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244. Measurement of thepn→ppπ0π−Reaction in Search of the ABC Resonance

Author: Skorodko, T., primary, Bashkanov, M., additional, Clement, H., additional, Doroshkevich, E., additional, Perez del Rio, E., additional, Pricking, A., additional, and Wagner, G. J., additional
Published: 2012
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245. Isospin Decomposition of the Basic Double-Pionic Fusion in the Region of the ABC Effect

Author: Bashkanov, M., primary, Clement, H., additional, Doroshkevich, E., additional, Perez del Rio, E., additional, Pricking, A., additional, Skorodko, T., additional, and Wagner, G. J., additional
Published: 2012
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246. Two-pion production in proton-proton collisions

Author: Bashkanov, M., Abdel-Samad, S., Brinkmann, K., Calen, Hans, Capellaro, Filippo, Clement, H., Demiroers, L., Doroshkevich, E., Dshemuchadse, S., Ekström, Curt, Erhardt, A., Eyrich, W., Fransson, Kjell, Freiesleben, H., Fritch, M., Gillitzer, G., Gustafsson, Leif, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Karsch, L., Keleta, Samson, Kilian, K., Koch, Inken, Kress, J., Kuhlmann, E., Kullander, Sven, Kupsc, Andrzej, Marcello, S., Marciniewski, Pawel, Meier, R., Möller, K., Morozov, B., Morsch, H.P., Pauli, C., Pethukov, Y., Rodenburg, E., Schönmeier, P., Schroder, W., Schulte-Wissermann, M., Scobel, W., Sefzick, T., Skorodko, T., Stepaniak, J., Wagner, G.J., Wagner, M., Wiedner, Ulrich, Wintz, P., Wuestner, P., Zabierowski, J., Zlomanczuk, Jozef, Zupranski, P., Bashkanov, M., Abdel-Samad, S., Brinkmann, K., Calen, Hans, Capellaro, Filippo, Clement, H., Demiroers, L., Doroshkevich, E., Dshemuchadse, S., Ekström, Curt, Erhardt, A., Eyrich, W., Fransson, Kjell, Freiesleben, H., Fritch, M., Gillitzer, G., Gustafsson, Leif, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Karsch, L., Keleta, Samson, Kilian, K., Koch, Inken, Kress, J., Kuhlmann, E., Kullander, Sven, Kupsc, Andrzej, Marcello, S., Marciniewski, Pawel, Meier, R., Möller, K., Morozov, B., Morsch, H.P., Pauli, C., Pethukov, Y., Rodenburg, E., Schönmeier, P., Schroder, W., Schulte-Wissermann, M., Scobel, W., Sefzick, T., Skorodko, T., Stepaniak, J., Wagner, G.J., Wagner, M., Wiedner, Ulrich, Wintz, P., Wuestner, P., Zabierowski, J., Zlomanczuk, Jozef, and Zupranski, P.
Published: 2004

247. Mechanical design of the WASA DIRC

Author: Bashkanov, M, primary, Clement, H, additional, Doroshkevich, E, additional, Rio, E Perez del, additional, Priking, A, additional, and Skorodko, T, additional
Published: 2011
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248. Erratum to “Exclusive measurements of pp→dπ+π0: Double-pionic fusion without ABC effect” [Phys. Lett. B 684 (2–3) (2010) 110]

Author: Kren, F., primary, Bashkanov, M., additional, Bogoslawsky, D., additional, Calén, H., additional, Clement, H., additional, Demiroers, L., additional, Ekström, C., additional, Fransson, K., additional, Greiff, J., additional, Gustafsson, L., additional, Höistad, B., additional, Ivanov, G., additional, Jacewicz, M., additional, Jiganov, E., additional, Johansson, T., additional, Khakimova, O., additional, Keleta, S., additional, Koch, I., additional, Kullander, S., additional, Kupść, A., additional, Marciniewski, P., additional, Meier, R., additional, Morosov, B., additional, Pauly, C., additional, Petrén, H., additional, Petukhov, Y., additional, Povtorejko, A., additional, Ruber, R.J.M.Y., additional, Schönning, K., additional, Scobel, W., additional, Skorodko, T., additional, Shwartz, B., additional, Stepaniak, J., additional, Thörngren-Engblom, P., additional, Tikhomirov, V., additional, Wagner, G.J., additional, Wolke, M., additional, Yamamoto, A., additional, Zabierowski, J., additional, and Zlomanczuk, J., additional
Published: 2011
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249. Abashian-Booth-Crowe Effect in Basic Double-Pionic Fusion: A New Resonance?

Author: Adlarson, P., primary, Adolph, C., additional, Augustyniak, W., additional, Baru, V., additional, Bashkanov, M., additional, Bednarski, T., additional, Bergmann, F. S., additional, Berłowski, M., additional, Bhatt, H., additional, Brinkmann, K.-T., additional, Büscher, M., additional, Calén, H., additional, Clement, H., additional, Coderre, D., additional, Czerwiński, E., additional, Doroshkevich, E., additional, Ekström, C., additional, Engels, R., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goslawski, P., additional, Grigoryev, K., additional, Grishina, V., additional, Gullström, C.-O., additional, Hampe, J., additional, Hanhart, C., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hinterberger, F., additional, Hodana, M., additional, Höistad, B., additional, Jacewicz, M., additional, Janusz, M., additional, Jany, A., additional, Jany, B. R., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khakimova, O., additional, Khoukaz, A., additional, Kistryn, S., additional, Klaja, J., additional, Kleines, H., additional, Kłos, B., additional, Kren, F., additional, Krzemień, W., additional, Kulessa, P., additional, Kullander, S., additional, Kupść, A., additional, Lalwani, K., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Mikirtychiants, M., additional, Moskal, P., additional, Morsch, H.-P., additional, Nandi, B. K., additional, Niedźwiecki, S., additional, Ohm, H., additional, Passfeld, A., additional, Pauly, C., additional, Perez del Rio, E., additional, Petukhov, Y., additional, Piskunov, N., additional, Pluciński, P., additional, Podkopał, P., additional, Povtoreyko, A., additional, Prasuhn, D., additional, Pricking, A., additional, Pysz, K., additional, Rausmann, T., additional, Redmer, C. F., additional, Ritman, J., additional, Roy, A., additional, Ruber, R. J. M. Y., additional, Rudy, Z., additional, Sawant, S., additional, Schadmand, S., additional, Schmidt, A., additional, Schroeder, W., additional, Sefzick, T., additional, Serdyuk, V., additional, Shah, N., additional, Siemaszko, M., additional, Siudak, R., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Täschner, A., additional, Tolba, T., additional, Trzciński, A., additional, Varma, R., additional, Vlasov, P., additional, Wagner, G. J., additional, Węglorz, W., additional, Winnemöller, A., additional, Wirzba, A., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Wurm, P., additional, Yuan, X., additional, Yurev, L., additional, Zabierowski, J., additional, Zheng, C., additional, Zieliński, M. J., additional, Zipper, W., additional, Złomańczuk, J., additional, and Żuprański, P., additional
Published: 2011
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250. ΔΔ excitation in proton–proton induced π0π0 production

Author: Skorodko, T., primary, Bashkanov, M., additional, Bogoslawsky, D., additional, Calén, H., additional, Clement, H., additional, Doroshkevich, E., additional, Demiroers, L., additional, Ekström, C., additional, Fransson, K., additional, Gustafsson, L., additional, Höistad, B., additional, Ivanov, G., additional, Jacewicz, M., additional, Jiganov, E., additional, Johansson, T., additional, Khakimova, O., additional, Keleta, S., additional, Koch, I., additional, Kren, F., additional, Kullander, S., additional, Kupść, A., additional, Marciniewski, P., additional, Meier, R., additional, Morosov, B., additional, Pauly, C., additional, Petrén, H., additional, Petukhov, Y., additional, Povtorejko, A., additional, Ruber, R.J.M.Y., additional, Schönning, K., additional, Scobel, W., additional, Shwartz, B., additional, Stepaniak, J., additional, Thörngren-Engblom, P., additional, Tikhomirov, V., additional, Wagner, G.J., additional, Wolke, M., additional, Yamamoto, A., additional, Zabierowski, J., additional, and Zlomanczuk, J., additional
Published: 2011
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