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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Abstract

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
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Glazier, Dr Derek and McGeorge, Dr John and Robinson, Mr Jamie and Downie, Dr Evangeline and MacGregor, Professor I 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:0556-2813
ISSN (Online):1089-490X

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