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23 results on '"Bardan, Wiktor"'

1. Search for $\eta$ mesic $^{3}He$ with the WASA-at-COSY facility in the $pd \rightarrow ^{3}He2\gamma$ and $pd \rightarrow ^{3}He6\gamma$ reactions

Author

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

Published
2020

2. Examination of the production of an isotensor dibaryon in the $pp\rightarrow pp\pi^{+}\pi^{-}$ reaction

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Parol, W., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Złomańczuk, J., Żuprański, P., and Żurek, M.

Published
2019

3. Study of the η → π+π−π0 decay in p − p collisions with WASA-at-COSY

Author

Bardan Wiktor

Subjects
Physics, QC1-999
Abstract

Study of the η → π+π−π0 decay allows for precise tests of the C parity conservation, makes possible to set constraints on the u and d as well as s and d quark mass ratios and can be used for a verification of the predictions of the Chiral Perturbation Theory (ChPT). The WASA-at-COSY collaboration has accumulated the world largest numbers of η mesons produced in p − d and p − p collisions. This report includes preliminary results of the ongoing analysis of the η → π+π−π0 decay from p − p data which were collected during 8 weeks of the COSY beam time in 2010 in Forschungszentrum Jülich with more than 108 η mesons produced.

Published
2012
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4. Importance of d-wave contributions in the charge symmetry breaking reaction $dd\rightarrow ^{4}He\pi^{0}$

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C.-O., Hanhart, C., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khatri, Ghanshyambhai, Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Parol, W., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
charge symmetry breaking, deuteron-deuteron interactions, pion production
Published
2018

5. Backward single-pion production in the $pd \rightarrow ^{3}He\pi ^{0}$ reaction with WASA-at-COSY

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bondar, A., Buscher, M., Calen, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Fohl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstrom, C.-O., Heijkenskjold, L., Hejny, V., Husken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khatri, Ghanshyambhai, Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Parol, W., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stapaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, Aleksandra, Wustner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Złomańczuk, J., Żuprański, P., Żurek, M., and Wilkin, C.

Published
2018

6. Isotensor dibaryon in the $pp \rightarrow pp\pi ^{+}\pi ^{-}$ reaction?

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergamnn, F. S., Berłowski, M., Bondar, A., Buscher, M., Calen, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Fohl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Heijkenskjold, L., Hejny, V., Husken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Parol, W., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, Aleksandra, Wustner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Złomańczuk, J., Żuprański, P., and Żurek, M.

Published
2018

7. Search for C violation in the decay $\eta \rightarrow \pi ^{0}e^{+}e^{-}$ with WASA-at-COSY

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bondar, A., Buscher, M., Calen, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Fohl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstrom, C.-O., Heijkenskjold, L., Hejny, V., Husken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khatri, Ghanshyambhai, Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Parol, W., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, Aleksandra, Wustner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Złomańczuk, J., Żuprański, P., Żurek, M., and Wirzba, A.

Published
2018

8. Search for $\eta$-mesic $^{4}He$ in the $dd\rightarrow ^{3}Hen\pi ^{0}$ and $dd\rightarrow ^{3}Hep\pi ^{-}$ reactions with the WASA-at-COSY facility

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C.-O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kelkar, N. G., Kemmerling, G., Khatri, Ghanshyambhai, Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Varma, R., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
η-Mesic nuclei, η meson
Published
2017

9. Measurement of the $\omega \rightarrow \pi ^{+}\pi ^{-}\pi ^{0}$ Dalitz plot distribution

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C.-O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khan, F. A., Khatri, Ghanshyambhai, Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Varma, R., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Zink, A., Złomańczuk, J., Żuprański, P., Żurek, M., Kubis, B., and Leupold, S.

Subjects
density, omega(783), statistical [error], parametrization [Dalitz plot], Juelich COSY PS, mass [pi], final-state interaction, decay [meson], omega(783) $\rightarrow pi^{+} pi^{-} pi^{0}$, Uppsala CELSIUS Stor, phase space, phase shift, kinematics, WASA, $pi^{+} pi^{-}$, experimental results
Published
2017

10. Isoscalar single-pion production in the region of Roper and $d^{\star }$ (2380) resonances

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calen, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Grigoryev, A. Goswami K., Gullström, C.-O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khatri, Ghanshyambhai, Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupsc, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Marianski, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Parol, W., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Złomanczuk, J., Zupranski, P., and Zurek, M.

Subjects
isoscalar part, roper resonance, single-pion production, Dibaryon resonance
Published
2017

11. Measurement of the $\vec{n}p\rightarrow d\pi ^{0}\pi ^{0}$ reaction with polarized beam in the region of the $d^{\ast }$ (2380) resonance

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, Izabela, Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C.-O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khan, F. A., Khatri, Ghanshyambhai, Khoukaz, A., Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Siudak, R., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Täschner, A., Trzciński, A., Varma, R., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Published
2016

12. Measurement of the $np\rightarrow np\pi^{0} \pi ^{0}$ reaction in search for the recently observed $d^{\ast}$ (2380) resonance

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, Izabela, Clement, H., Coderre, D., Czerwiński, Eryk, Demmich, K., Doroshkevich, E., Engels, R., Erven, A., 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., Höistad, B., Hüsken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Mikirtychiants, M., Morsch, H.-P., Moskal, Paweł, Ohm, H., Schätti - Ozerianska, Iryna, Perez del Rio, Elena, Piskunov, N. M., Podkopał, Paweł, Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., Shwartz, B., Siudak, R., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Täschner, A., Trzciński, A., Varma, R., Wagner, G. J., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Wurm, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
ABC effect and resonance structure, dibaryon resonance, two-pion production
Published
2015

13. Cross section ratio and angular distributions of the reaction $p + d \rightarrow ^{3}He + \it{\eta}$ at 48.8 MeV and 59.8 MeV excess energy

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Büscher, M., Calén, H., Ciepał, Izabela, Clement, H., Coderre, D., Czerwiński, Eryk, Demmich, K., Doroshkevich, E., Engels, R., Erven, A., 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., Hodana, Małgorzata, Höistad, B., Hüsken, N., Jany, Anna, Jany, Benedykt, Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, Stanisław, Kłos, B., Kleines, H., Krapp, M., Krzemień, Wojciech, Kulessa, P., Kupść, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Mikirtychiants, M., Morsch, H.-P., Moskal, Paweł, Ohm, H., Schätti - Ozerianska, Iryna, Passfeld, A., Perez del Rio, Elena, Piskunov, N. M., Podkopał, Paweł, Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Redmer, C. F., Ritman, J., Roy, A., Rudy, Zbigniew, Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., Siudak, R., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Täschner, A., Trzciński, A., Varma, R., Wagner, G. J., Węglorz, W., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Wurm, P., Yamamoto, A., Yurev, L., Zabierowski, J., Zieliński, Marcin, Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
Physics::Accelerator Physics, Nuclear Experiment
Abstract

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

Published
2014

14. Measurement of the $\eta \rightarrow \pi ^{+}\pi ^{-}\pi ^{0}$ Dalitz plot distribution

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, Izabela, Clement, H., Coderre, D., Czerwiński, Eryk, Demmich, K., Doroshkevich, E., Engels, R., Erven, A., 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., Hodana, Małgorzata, Höistad, B., Hüsken, N., Jany, Anna, Jany, Benedykt, Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Martemyanov, B. V., Meißner, U.-G., Mikirtychiants, M., Morsch, H.-P., Moskal, Paweł, Ohm, H., Schätti - Ozerianska, Iryna, Perez del Rio, Elena, Piskunov, N. M., Podkopał, Paweł, Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Redmer, C. F., Ritman, J., Roy, A., Rudy, Zbigniew, Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., Shwartz, B., Siudak, R., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Täschner, A., Trzciński, A., Varma, R., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zieliński, Marcin, Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

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

Published
2014

15. Charge symmetry breaking in $dd\rightarrow ^{4}He\pi ^{0}$ with WASA-at-COSY

Author

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

Subjects
charge symmetry breaking, deuteron–deuteron interactions, pion production, Nuclear Experiment
Abstract

Charge symmetry breaking (CSB) observables are a suitable experimental tool to examine effects induced by quark masses on the nuclear level. Previous high precision data from TRIUMF and IUCF are currently used to develop a consistent description of CSB within the framework of chiral perturbation theory. In this work the experimental studies on the reaction dd\rightarrow $^{4}He\pi ^{0}$ have been extended towards higher excess energies in order to provide information on the contribution of p-waves in the final state. For this, an exclusive measurement has been carried out at a beam momentum of $p_{d}=1.2$ GeV/c using the WASA-at-COSY facility. The total cross section amounts to $\sigma _{tot} = (118 \pm 18_{stat} \pm 13_{sys} \pm 8_{ext}) pb$ and first data on the differential cross section are consistent with s-wave pion production.

Published
2014

16. Search for $\eta$-mesic ^{4}He with the WASA-at-COSY detector

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bednarski, Tomasz, Bergmann, F. S., Berłowski, M., Bhatt, H., Büscher, M., Calén, Hans, Clement, H., Coderre, D., Czerwiński, Eryk, 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, Małgorzata, Höistad, B., Jany, Anna, Jany, Benedykt, Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, Stanisław, Klaja, Joanna, Kleines, H., Kłos, B., Krapp, M., Krzemień, Wojciech, Kulessa, P., Kupść, A., Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Mikirtychiants, M., Morsch, H.-P., Moskal, Paweł, Nandi, B. K., Niedźwiecki, Szymon, Ohm, H., Schätti - Ozerianska, Iryna, Perez del Rio, Elena, Pluciński, P., Podkopał, Paweł, Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Redmer, C. F., Ritman, J., Roy, A., Rudy, Zbigniew, Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Tolba, T., Trzciński, A., Varma, R., Vlasov, P., Wagner, G. J., Węglorz, W., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zieliński, Marcin, Zipper, W., Złomańczuk, J., Żuprański, P., and Żurek, M.

Published
2013

17. Search for a dark photon in the $\pi ^{0}\rightarrow e^{+}e^{-}\gamma$ decay

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Berłowski, M., Bhatt, H., Bondar, A., Calén, Hans, Ciepał, Izabela, Clement, H., Coderre, D., Czerwiński, Eryk, Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Goldenbaum, E., Goslawski, P., Goswami, A., Gullström, C.-O., Hauenstein, F., Hejny, V., Hinterberger, F., Hodana, Małgorzata, Jany, Anna, Jany, Benedykt, Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khan, F. A., Khoukaz, A., Klaja, Joanna, Kleines, H., Kirillov, D. A., Kłos, B., Krapp, M., Krzemień, Wojciech, Kulessa, P., Kupść, A., Lalwani, K., Lersch, D., Li, L., Lorentz, B., Maier, R., Marciniewski, P., Mariański, B., Mikirtychiants, M., Morsch, H.-P., Moskal, Paweł, Nandi, B. K., Ohm, H., Schätti - Ozerianska, Iryna, Perez del Rio, Elena, Pluciński, P., Podkopał, Paweł, Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Sawant, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Shwartz, B., Siemaszko, M., Siudak, R., Skorodko, T., Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Tolba, T., Trzciński, A., Varma, R., Węglorz, W., Wirzba, A., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Wurm, P., Yamamoto, A., Zabierowski, J., Zipper, W., Złomańczuk, J., Żuprański, P., Bergmann, F. S., Büscher, M., Fransson, K., Grigoryev, K., Heijkenskjöld, L., Höistad, B., Kistryn, Stanisław, Kuzmin, A., Magiera, Andrzej, Meißner, U.-G., Piskunov, N. M., Pricking, A., Redmer, C. F., Schadmand, S., Wagner, G. J., Skurzok, Magdalena, Zieliński, Marcin, and Żurek, M.

Subjects
dark forces, gauge vector boson
Published
2013

18. Investigation of the dd\rightarrow $^{3}Hen\pi ^{0}$ reaction with the FZ Jülich WASA-at-COSY facility

Author

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

Abstract

An exclusive measurement of the dd\rightarrow $^{3}Hen\pi^{0}$ eaction 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 $\sigma _{tot}= \left ( 2.89\pm 0.01_{stat}\pm 0.06_{sys}\pm 0.29_{norm} \right )\mu b$. 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

19. Measurement of the $pn \rightarrow pp\pi ^{0}\pi ^{-}$ reaction in search for the recently observed resonance structure in $d\pi ^{0}\pi ^{0}$ and $d\pi ^{+}\pi ^{-}$ systems

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Büscher, M., Calén, H., Ciepał, Izabela, Clement, H., Coderre, D., Czerwiński, Eryk, 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, Małgorzata, Höistad, B., Jany, Anna, Jany, Benedykt, Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, Stanisław, Klaja, Joanna, Kleines, H., Kłos, B., Krapp, M., Krzemień, Wojciech, Kulessa, P., Kupść, A., Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Mikirtychiants, M., Morsch, H.-P., Moskal, Paweł, Nandi, B. K., Ohm, H., Schätti - Ozerianska, Iryna, Perez del Rio, Elena, Piskunov, N. M., Pluciński, P., Podkopał, Paweł, Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Redmer, C. F., Ritman, J., Roy, A., Rudy, Zbigniew, Sawant, S., Schmidt, A., Schadmand, S., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, 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., Węglorz, W., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Wurm, P., Yamamoto, A., Yuan, X., Zabierowski, J., Zheng, C., Zieliński, Marcin, Zipper, W., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
Nuclear Experiment
Abstract

Exclusive measurements of the quasifree $pn\rightarrow pp\pi ^{0}\pi ^{-}$ 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 für Kernphysik, Jülich). Total and differential cross sections have been obtained covering the energy region $\sqrt{8}=\left ( 2.35-2.46 \right )$ GeV, which includes the region of the ABC effect and its associated resonance structure. No ABC effect, 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, $\Delta \left ( 1600 \right )$ 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 $I\left ( J^{P} \right )=0\left ( 3^{+} \right )$ observed recently in $pn\rightarrow d\pi ^{0}\pi ^{0}$ and $pn\rightarrow d\pi ^{+}\pi ^{-}$ reactions leads to an agreement with the data also at low energies.

Published
2013

20. Study of the η → π + π − π 0 decay in p − p collisions with WASA-at-COSY

Author

Bardan, Wiktor and Collaboration, WASA@COSY

Subjects
Physics, Quark, Nuclear physics, Chiral perturbation theory, Meson, QC1-999, C parity, ddc:530, Astrophysics, Beam (structure)
Abstract

Study of the η → π + π − π 0 decay allows for precise tests of the C parity conservation, makes possible to set constraints on the u and d as well as s and d quark mass ratios and can be used for a verification of the predictions of the Chiral Perturbation Theory (ChPT). The WASA-at-COSY collaboration has accumulated the world largest numbers of η mesons produced in p − d and p − p collisions. This report includes preliminary results of the ongoing analysis of the η → π + π − π 0 decay from p − p data which were collected during 8 weeks of the COSY beam time in 2010 in Forschungszentrum Julich with more than 10 8 η mesons produced.

Published
2012

21. Exclusive measurement of the $\eta \rightarrow \pi^{+} \pi^{-} \gamma$ decay

Author

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

Subjects
box anomaly, exclusive measurement, High Energy Physics::Experiment, $\eta$ meson, Nuclear Experiment
Abstract

An exclusive measurement of the decay $\eta \rightarrow \pi^{+} \pi^{-} \gamma$ has been performed at the WASA facility at COSY. The $\eta$ mesons were produced in the fusion reaction $pd \rightarrow ^{3}He X$ at a proton beam momentum of 1.7 GeV/c. Efficiency corrected differential distributions have been extracted based on 13 960 $\pm$ 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 $\eta \rightarrow \pi^{+} \pi^{-} \gamma$. 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

23. Study of the η → π+π-π0 decay in p - p collisions with WASA-at-COSY.

Author

Bardan, Wiktor

Subjects
*PERTURBATION theory, *CHIRALITY, *MESONS, *COLLISIONS (Nuclear physics), *ELECTRONS
Abstract

Study of the η → π+π-π0 decay allows for precise tests of the C parity conservation, makes possible to set constraints on the u and d as well as s and d quark mass ratios and can be used for a verification of the predictions of the Chiral Perturbation Theory (ChPT). The WASA-at-COSY collaboration has accumulated the world largest numbers of η mesons produced in p - d and p - p collisions. This report includes preliminary results of the ongoing analysis of the η → π+π-π0 decay from p - p data which were collected during 8 weeks of the COSY beam time in 2010 in Forschungszentrum Jülich with more than 108 η mesons produced. [ABSTRACT FROM AUTHOR]

Published
2012
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