Measurement of the slope parameter alpha for the eta -> 3 pi(0) decay with the Crystal Ball detector at the Mainz Microtron (MAMI-C)

S. Prakhov, B. M. K. Nefkens, P. Aguar-Bartolome, L. K. Akasoy, J. R. M. Annand, H. J. Arends, K. Bantawa, R. Beck, V. Bekrenev, H. Berghaeuser, B. Boillat, A. Braghieri, D. Branford, W. J. Briscoe, J. Brudvik, S. Cherepnya, R. F. B. Codling, E. J. Downie, P. Drexler, L. V. Fil'kovD. I. Glazier, R. Gregor, E. Heid, D. Hornidge, O. Jahn, T. C. Jude, V. L. Kashevarov, J. D. Kellie, R. Kondratiev, M. Korolija, M. Kotulla, A. Koulbardis, D. Krambrich, S. Kruglov, B. Krusche, M. Lang, V. Lisin, K. Livingston, I. J. D. MacGregor, Y. Maghrbi, D. M. Manley, M. Martinez, J. C. McGeorge, E. F. McNicoll, D. Mekterovic, V. Metag, S. Micanovic, A. Nikolaev, R. Novotny, M. Ostrick, P. B. Otte, P. Pedroni, F. Pheron, A. Polonski, J. Robinson, G. Rosner, M. Rost, T. Rostomyan, S. Schumann, M. H. Sikora, D. I. Sober, A. Starostin, I. M. Suarez, I. Supek, C. M. Tarbert, M. Thiel, A. Thomas, M. Unverzagt, D. P. Watts, I. Zamboni, F. Zehr

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The dynamics of the eta -> 3 pi(0) decay have been studied with the Crystal Ball multiphoton spectrometer and the TAPS calorimeter. Bremsstrahlung photons produced by the 1.5-GeV electron beam of the Mainz microtron MAMI-C and tagged by the Glasgow photon spectrometer were used for eta-meson production. The analysis of 3x10(6) gamma p ->eta p -> 3 pi(0)p -> 6 gamma p events yields the value alpha=-0.032 +/- 0.003 for the eta -> 3 pi(0) slope parameter, which agrees with the majority of recent experimental results and has the smallest uncertainty. The pi(0)pi(0) invariant-mass spectrum was investigated for the occurrence of a cusplike structure in the vicinity of the pi(+)pi(-) threshold. The observed effect is small and does not affect our measured value for the slope parameter.

Original languageEnglish
Article number035204
Pages (from-to)-
Number of pages13
JournalPhysical Review C
Issue number3
Publication statusPublished - Mar 2009


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