Measurement of the slope parameter α for the η→3π(0) decay with the Crystal Ball detector at the Mainz Microtron (MAMI-C)

Prakhov, S. et al. (2009) Measurement of the slope parameter α for the η→3π(0) decay with the Crystal Ball detector at the Mainz Microtron (MAMI-C). Physical Review C, 79(3), 035204. (doi: 10.1103/PhysRevC.79.035204)

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The dynamics of the η→3π0 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 η-meson production. The analysis of 3×106 γp→ηp→3π0p→6γp events yields the value α=-0.032±0.003 for the η→3π0 slope parameter, which agrees with the majority of recent experimental results and has the smallest uncertainty. The π0π0 invariant-mass spectrum was investigated for the occurrence of a cusplike structure in the vicinity of the π+π- threshold. The observed effect is small and does not affect our measured value for the slope parameter.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Glazier, Dr Derek and McGeorge, Dr John and Robinson, Mr Jamie and Downie, Dr Evangeline and MacGregor, Professor Douglas and Livingston, Dr Kenneth and McNicoll, Miss Eilidh and Annand, Dr John and Kellie, Dr James and Rosner, Professor Guenther
Authors: Prakhov, S., Nefkens, B.M.K., Aguar-Bartolome, P., Akasoy, L.K., Annand, J.R.M., Arends, H.J., Bantawa, K., Beck, R., Bekrenev, V., Berghauser, H., Boillat, B., Braghieri, A., Branford, D., Briscoe, W.J., Brudvik, J., Cherepnya, S., Codling, R.F.B., Downie, E.J., Drexler, P., Fil'kov, L.V., Glazier, D.I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Jude, T.C., Kashevarov, V.L., Kellie, J.D., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Krambrich, D., Kruglov, S., Krusche, B., Lang, M., Lisin, V., Livingston, K., MacGregor, I.J.D., Maghrbi, Y., Manley, D.M., Martinez, M., McGeorge, J.C., McNicoll, E.F., Mekterovic, D., Metag, V., Micanovic, S., Nikolaev, A., Novotny, R., Ostrick, M., Otte, P.B., Pedroni, P., Pheron, F., Polonski, A., Robinson, J., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sikora, M.H., Sober, D.I., Starostin, A., Suarez, I.M., Supek, I., Tarbert, C.M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D.P., Zamboni, I., and Zehr, F.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review C
Publisher:American Physical Society
ISSN (Online):1089-490X

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