High-statistics measurement of the η → 3 π 0 decay at the Mainz Microtron
- Prakhov, S.
- Abt, S.
- Bantawa, K.
- Bashkanov, M.
- Beck, R.
- Biroth, M.
- Borisov, N. S.
- Braghieri, A.
- Briscoe, W. J.
- Cherepnya, S.
- Cividini, F.
- Collicott, C.
- Achenbach, P.
- Costanza, S.
- Denig, A.
- Dieterle, M.
- Downie, E. J.
- Drexler, P.
- Ferretti Bondy, M. I.
- Fil'kov, L. V.
- Fix, A.
- Gardner, S.
- Garni, S.
- Adlarson, P.
- Glazier, D. I.
- Gorodnov, I.
- Gradl, W.
- Gurevich, G. M.
- Hamill, C. B.
- Heijkenskjöld, L.
- Hornidge, D.
- Huber, G. M.
- Käser, A.
- Kashevarov, V. L.
- Afzal, F.
- Kay, S.
- Keshelashvili, I.
- Kondratiev, R.
- Korolija, M.
- Krusche, B.
- Lazarev, A.
- Lisin, V.
- Livingston, K.
- Lutterer, S.
- MacGregor, I. J. D.
- Aguar-Bartolomé, P.
- Manley, D. M.
- Martel, P. P.
- McGeorge, J. C.
- Middleton, D. G.
- Miskimen, R.
- Mornacchi, E.
- Mushkarenkov, A.
- Neganov, A.
- Neiser, A.
- Oberle, M.
- Ahmed, Z.
- Ostrick, M.
- Otte, P. B.
- Paudyal, D.
- Pedroni, P.
- Polonski, A.
- Ron, G.
- Rostomyan, T.
- Sarty, A.
- Sfienti, C.
- Sokhoyan, V.
- Ahrens, J.
- Spieker, K.
- Steffen, O.
- Strakovsky, I. I.
- Strandberg, B.
- Strub, Th.
- Supek, I.
- Thiel, A.
- Thiel, M.
- Thomas, A.
- Unverzagt, M.
- Annand, J. R. M.
- Usov, Yu. A.
- Wagner, S.
- Walford, N. K.
- Watts, D. P.
- Werthmüller, D.
- Wettig, J.
- Witthauer, L.
- Wolfes, M.
- Zana, L. A.
- Arends, H. J.
DOIAbstract
The largest, at the moment, statistics of 7×106η→3π0 decays, based on 6.2×107η mesons produced in the γp→ηp reaction, has been accumulated by the A2 Collaboration at the Mainz Microtron, MAMI. It allowed a detailed study of the η→3π0 dynamics beyond its conventional parametrization with just the quadratic slope parameter α and enabled, for the first time, a measurement of the second-order term and a better understanding of the cusp structure in the neutral decay. The present data are also compared to recent theoretical calculations that predict a nonlinear dependence along the quadratic distance from the Dalitz-plot center
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