Journal article
Authors list: Adlarson, R.; Collaboration, WASA-at-COSY; Augustyniak, W.; Bardan, W.; Bashkanov, M.; Bergmann, F. S.; Berlowski, M.; Bondar, A.; Buescher, M.; Calen, H.; Ciepal, I.; Clement, H.; Czerwinski, E.; Demmich, K.; Engels, R.; Erven, A.; Erven, W.; Eyrich, W.; Fedorets, R.; Foehl, K.; Fransson, K.; Goldenbaum, F.; Goswami, A.; Grigoryev, K.; Gullstrom, C. -O.; Heijkenskjold, L.; Hejny, V.; Huesken, N.; Jarczyk, L.; Johansson, T.; Kamys, B.; Kemmerling, G.; Khatri, G.; Khoukaz, A.; Khreptak, A.; Kirillov, D. A.; Kistryn, S.; Kleines, H.; Klos, B.; Krzemien, W.; Kulessa, R.; Kupsc, A.; Kuzmin, A.; Lalwani, K.; Lersch, D.; Lorentz, B.; Magiera, A.; Maier, R.; Marciniewski, R.; Marianski, B.; Morsch, H. -P; Moskal, R.; Ohm, H.; Parol, W.; del Rio, E. Perez; Piskunov, N. M.; Prasuhn, D.; Pszczel, D.; Pysz, K.; Pyszniak, A.; 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, M.; Wronska, A.; Wuestner, R.; Yamamoto, A.; Zabierowski, J.; Zielinski, M. J.; Zlomanczuk, J.; Zupranski, R.; Zurek, M.; Wirzba, A.
Publication year: 2018
Pages: 378-384
Journal: Physics Letters B
Volume number: 784
ISSN: 0370-2693
eISSN: 1873-2445
DOI Link: https://doi.org/10.1016/j.physletb.2018.07.017
Publisher: Elsevier
Abstract:
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. (c) 2018 The Author. Published by Elsevier B.V.
Citation Styles
Harvard Citation style: Adlarson, R., Collaboration, W., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F., et al. (2018) Search for C violation in the decay η → π0e+e- with WASA-at-COSY, Physics Letters B, 784, pp. 378-384. https://doi.org/10.1016/j.physletb.2018.07.017
APA Citation style: Adlarson, R., Collaboration, W., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F., Berlowski, M., Bondar, A., Buescher, M., Calen, H., Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, R., ...Wirzba, A. (2018). Search for C violation in the decay η → π0e+e- with WASA-at-COSY. Physics Letters B. 784, 378-384. https://doi.org/10.1016/j.physletb.2018.07.017
Keywords
CONSERVING DECAY; upper limit
