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1. Search for a dark photon in the $\pi^0 \to e^+e^-\gamma$ decay

Author

Adlarson, P., Augustyniak, W., Ciepal, I., Trzcinski, A., Varma, R., Wagner, G. J., Weglorz, W., Wirzba, Andreas, Wolke, Magnus, Wronska, A., Wüstner, Peter, Wurm, Patrick, Yamamoto, A., Clement, H., Zabierowski, J., Zielinski, M. J., Zipper, W., Zlomanczuk, J., Zupranski, P., Zurek, M., Coderre, Daniel, Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, Ralf W., Erven, Wilhelm, Eyrich, W., Fedorets, Pavel, Bardan, W., Föhl, K., Fransson, K., Goldenbaum, Frank, Goslawski, P., Goswami, Ankita, Grigoryev, Kirill, Gullström, C. -O., Hauenstein, Florian, Heijkenskjöld, L., Hejny, Volker, Bashkanov, M., Hinterberger, F., Hodana, Malgorzata, Höistad, B., Jany, A., Jany, Benedykt, Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, Günter, Khan, Farha Anjum, Bergmann, F. S., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, Harald, Kirillov, D. A., Klos, B., Krapp, M., Krzemien, W., Kulessa, Pawel, Kupsc, Andrzej, Berlowski, M., Kuzmin, A., Lalwani, K., Lersch, Daniel, Li, L., Lorentz, Bernd, Magiera, A., Maier, Rudolf, Marciniewski, P., Marianski, B., Meißner, Ulf-G., Bhatt, Himani, Mikirtychyants, Maxim, Morsch, H. -P., Moskal, Pawel, Nandi, B. K., Ohm, Henner, Ozerianska, I., Perez del Rio, E., Piskunov, N. M., Plucinski, P., Podkopal, P., Bondar, A., Prasuhn, Dieter, Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, F., Ritman, James, Roy, A., Rudy, Z., Sawant, S., Büscher, Markus, Schadmand, Susan, Schmidt, A., Sefzick, Thomas, Serdyuk, Valeriy, Shah, N., Shwartz, B., Siemaszko, M., Siudak, R., Skorodko, T., Skruzok, M., Calen, Hans, Smyrski, J., Sopov, V., Stassen, Rolf, Stepaniak, J., Stephan, E., Sterzenbach, Guenter, Stockhorst, Hans, Stroeher, Hans, Szczurek, A., and Tolba, T.

Subjects
branching ratio: upper limit [pi0], +positron+electron+photon%22">pi0 --> positron electron photon, 0.55 GeV-kin, radiative decay [pi0], interaction [p p], Juelich COSY PS, High Energy Physics - Experiment, High Energy Physics - Phenomenology, magnetic moment [muon], +2p+pi0%22">p p --> 2p pi0, ddc:530, High Energy Physics::Experiment, WASA, Nuclear Experiment, mixing [photon], search for [U boson], mass spectrum [electron positron], experimental results, +U+boson+photon%22">pi0 --> U boson photon
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, Comment: 16 pages, 8 figures; improved analysis extending the exclusion region to 20 MeV

Published
2013
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2. Measurement of the eta -> 3 pi(0) Dalitz plot distribution with the WASA detector at COSY

Author

Adolph, C, Angelstein, M, Bashkanov, M, Bechstedt, U, Belostotski, S, Berlowski, M, Bhatt, H, Bisplinghoff, J, Bondar, A, Borasoy, B, Buescher, M, Calèn, H, Chandwani, K, Clement, H, Czerwinski, E, Czyzykiewicz, R, D'Orsaneo, G, Duniec, D, Ekström, C, Engels, R, Erven, W, Eyrich, W, Fedorets, P, Felden, O, Fransson, K, Gil, D, Goldenbaum, F, Grigoryev, K, Heczko, A, Hanhart, C, Hejny, V, Hinterberger, F, Hodana, M, Hoeistad, B, Izotov, A, Jacewicz, M, Janusz, M, Jany, R, Jarczyk, L, Johansson, T, Kamys, B, Kemmerling, G, Keshelashvili, I, Khakimova, O, Khoukaz, A, Kilian, K, Kimura, N, Kistryn, S, Klaja, J, Klaja, P, Kleines, H, Klos, B, Kowalczyk, A, Kren, F, Krzemien, W, Kulessa, P, Kullander, S, Kupsc, A, Kuzmin, A, Kyryanchuk, V, Majewski, J, Machner, H, Magiera, A, Maier, R, Marciniewski, R, Migdal, W, Meissner, U.-G., Mikirtychiants, M, Miklukho, O, Milke, N, Mittag, M, Moskal, P, Nandi, K, Nawrot, A, Nissler, R, Odoyo, A, Oelert, W, Ohm, H, Paul, N, Pauly, C, Petukhov, Y, Piskunov, N, Plucinski, P, Podkopal, P, Povtoreyko, A, Prasuhn, D, Pricking, A, Pysz, K, Rachowski, J, Rausmann, T, Redmer, F, Ritman, J, Roy, A, Ruber, R. J. M. Y, Rudy, Z, Salmin, R, Schadmand, S, Schmidt, A, Schneider, H, Schroeder, W, Scobel, W, Sefzick, T, Serdyuk, V, Shah, N, Siemaszko, M, Siudak, R, Skorodko, T, Smolinski, T, Smyrski, J, Sopov, V, Spoelgen, D, Stepaniak, J, Sterzenbach, G, Stroeher, H, Szczurek, A, Teufel, A, Tolba, T, Trzcinski, A, Ulbrich, K, Varma, R, Vlasov, P, Weglorz, W, Winnemoeller, A, Wirzba, A, Wolke, M, Wronska, A, Wuestner, R, Xu, H, Yamamoto, A, Yamaoka, H, Yuan, X, Yurev, L, Zabierowski, J, Zheng, C, Zielinski, J, Zipper, W, Zlomanczuk, J, Zwoll, K, Zychor, I, Adolph, C, Angelstein, M, Bashkanov, M, Bechstedt, U, Belostotski, S, Berlowski, M, Bhatt, H, Bisplinghoff, J, Bondar, A, Borasoy, B, Buescher, M, Calèn, H, Chandwani, K, Clement, H, Czerwinski, E, Czyzykiewicz, R, D'Orsaneo, G, Duniec, D, Ekström, C, Engels, R, Erven, W, Eyrich, W, Fedorets, P, Felden, O, Fransson, K, Gil, D, Goldenbaum, F, Grigoryev, K, Heczko, A, Hanhart, C, Hejny, V, Hinterberger, F, Hodana, M, Hoeistad, B, Izotov, A, Jacewicz, M, Janusz, M, Jany, R, Jarczyk, L, Johansson, T, Kamys, B, Kemmerling, G, Keshelashvili, I, Khakimova, O, Khoukaz, A, Kilian, K, Kimura, N, Kistryn, S, Klaja, J, Klaja, P, Kleines, H, Klos, B, Kowalczyk, A, Kren, F, Krzemien, W, Kulessa, P, Kullander, S, Kupsc, A, Kuzmin, A, Kyryanchuk, V, Majewski, J, Machner, H, Magiera, A, Maier, R, Marciniewski, R, Migdal, W, Meissner, U.-G., Mikirtychiants, M, Miklukho, O, Milke, N, Mittag, M, Moskal, P, Nandi, K, Nawrot, A, Nissler, R, Odoyo, A, Oelert, W, Ohm, H, Paul, N, Pauly, C, Petukhov, Y, Piskunov, N, Plucinski, P, Podkopal, P, Povtoreyko, A, Prasuhn, D, Pricking, A, Pysz, K, Rachowski, J, Rausmann, T, Redmer, F, Ritman, J, Roy, A, Ruber, R. J. M. Y, Rudy, Z, Salmin, R, Schadmand, S, Schmidt, A, Schneider, H, Schroeder, W, Scobel, W, Sefzick, T, Serdyuk, V, Shah, N, Siemaszko, M, Siudak, R, Skorodko, T, Smolinski, T, Smyrski, J, Sopov, V, Spoelgen, D, Stepaniak, J, Sterzenbach, G, Stroeher, H, Szczurek, A, Teufel, A, Tolba, T, Trzcinski, A, Ulbrich, K, Varma, R, Vlasov, P, Weglorz, W, Winnemoeller, A, Wirzba, A, Wolke, M, Wronska, A, Wuestner, R, Xu, H, Yamamoto, A, Yamaoka, H, Yuan, X, Yurev, L, Zabierowski, J, Zheng, C, Zielinski, J, Zipper, W, Zlomanczuk, J, Zwoll, K, and Zychor, I

Abstract

In the first production run of the WASA experiment at COSY, the eta decay into three neutral pions was measured in proton-proton interactions at a proton beam kinetic energy of 1.4 GeV. The Dalitz plot of the three pious was Studied using 1.2 x 10(5) fully reconstructed events. and the quadratic slope parameter alpha was determined to be -0.027 +/- 0.008(stat) +/- 0.005(syst). The result is consistent with previous measurements and further corroborates the importance of pion-pion final state interactions. (C) 2009 Elsevier B.V. All rights reserved.

Published
2009
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