Details

Autor(en) / Beteiligte

• Adlarson, Patrik
• Collaboration, WASA-at-COSY
• Augustyniak, W.
• Bardan, W.
• Bashkanov, M.
• Bergmann, F. S.
• Berlowski, M.
• Bondar, A.
• Buescher, M.
• Calén, Hans
• Ciepal, I.
• Clement, H.
• Czerwinski, E.
• Demmich, K.
• Engels, R.
• Erven, A.
• Erven, W.
• Eyrich, W.
• Fedorets, R.
• Foehl, K.
• Fransson, Kjell
• Goldenbaum, F.
• Goswami, A.
• Grigoryev, K.
• Gullström, Carl-Oskar
• Heijkenskjöld, Lena
• Hejny, V.
• Huesken, N.
• Jarczyk, L.
• Johansson, Tord
• Kamys, B.
• Kemmerling, G.
• Khatri, G.
• Khoukaz, A.
• Khreptak, A.
• Kirillov, D. A.
• Kistryn, S.
• Kleines, H.
• Klos, B.
• Krzemien, W.
• Kulessa, R.
• Kupsc, Andrzej
• Kuzmin, A.
• Lalwani, K.
• Lersch, D.
• Lorentz, B.
• Magiera, A.
• Maier, R.
• Marciniewski, Pawel
• Marianski, B.
• Morsch, H. -P
• Moskal, R.
• Ohm, H.
• Parol, W.
• del Rio, E. Perez
• Piskunov, N. M.
• Prasuhn, D.
• Pszczel, Damian
• Pysz, K.
• Pyszniak, Andzej
• Ritman, J.
• Roy, A.
• Rudy, Z.
• Rundel, O.
• Sawant, S.
• Schadmand, S.
• Schatti-Ozerianska, I.
• Sefzick, T.
• Serdyuk, V.
• Shwartz, B.
• Sitterberg, K.
• Skorodko, T.
• Skurzok, M.
• Smyrski, J.
• Sopov, V.
• Stassen, R.
• Stepaniak, J.
• Stephan, E.
• Sterzenbach, G.
• Stockhorst, H.
• Stroeher, H.
• Szczurek, A.
• Trzcinski, A.
• Wolke, Magnus
• Wronska, A.
• Wuestner, R.
• Yamamoto, A.
• Zabierowski, J.
• Zielinski, M. J.
• Zlomanczuk, Jozef
• Zupranski, R.
• Zurek, M.
• Wirzba, A.

Titel

Search for C violation in the decay eta -> pi(0)e(+)e(-) with WASA-at-COSY

Ist Teil von

• Physics letters. B, 2018, Vol.784, p.378

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We report on the search for the rare decay eta -> pi(0)e(+)e(-) which is of interest to study C violation in the electromagnetic interaction which would indicate contributions from physics beyond the Standard Model, since the allowed decay via a two-photon intermediate state is strongly suppressed. The experiment has been performed using the WASA-at-COSY installation, located at the COSY accelerator of the Forschungszentrum Julich, Germany. In total 3 x 10(7) events of the reaction pd -> He-3 eta have been recorded at an excess energy of Q = 59.8MeV. Based on this data set the C parity violating decay eta -> pi(0)gamma* -> pi(0)e(+)e(-) via a single-photon intermediate state has been searched for, resulting in new upper limits of Gamma(eta -> pi(0)e(+) e(-))/Gamma(eta -> pi(+) pi(-) pi(0)) < 3.28 x 10(-5) and Gamma(eta -> pi(0)e(+) e(-))/Gamma(eta -> all)< 7.5 x 10(-6) (CL=90%), respectively.