Determination of the Dalitz plot parameter alpha for the decay eta -> 3 pi(0) with the Crystal Ball at MAMI-B

M. Unverzagt, P. Aguar-Bartolome, J. Ahrens, J. R. M. Annand, H. J. Arends, R. Beck, V. Bekrenev, B. Boillat, A. Braghieri, D. Branford, W. J. Briscoe, J. W. Brudvik, S. Cherepnya, R. Codling, E. J. Downie, L. V. Fil'kov, D. I. Glazier, R. Gregor, E. Heid, D. HornidgeO. Jahn, V. L. Kashevarov, R. Kondratiev, M. Korolija, M. Kotulla, D. Krambrich, B. Krusche, M. Lang, V. Lisin, K. Livingston, S. Lugert, I. J. D. MacGregor, D. M. Manley, M. Martinez-Fabregate, J. C. McGeorge, D. Mekterovic, V. Metag, B. M. K. Nefkens, A. Nikolaev, R. Novotny, R. O. Owens, P. Pedroni, A. Polonski, S. N. Prakhov, J. W. Price, G. Rosner, M. Rost, T. Rostomyan, S. Schumann, D. Sober, A. Starostin, I. Supek, C. M. Tarbert, A. Thomas, Th. Walcher, D. P. Watts, F. Zehr

Research output: Contribution to journalArticlepeer-review


A precise measurement of the Dalitz plot parameter, alpha, for the eta -> 3 pi(0) decay is presented. The experiment was performed with the Crystal Ball and TAPS large-acceptance photon detectors at the tagged photon beam facility of the MAMI-B electron accelerator in Mainz. High statistics of 1.8.10(6) eta -> 3 pi(0) events were obtained, giving the result alpha = -0.032 +/- 0.002(stat) +/- 0.002(syst).

Original languageEnglish
Pages (from-to)169-177
Number of pages9
JournalEuropean Physical Journal A: Hadrons and Nuclei
Issue number2
Publication statusPublished - Feb 2009

Cite this