/ hep-ex arXiv:1709.04230

Measurement of the decay $\eta^{\prime}\to\pi^{0}\pi^{0}\eta$ at MAMI

Adlarson, P. (Mainz U., Inst. Kernphys.) ; Afzal, F. (Bonn U., HISKP) ; Akondi, C.S. (Kent State U. (main)) ; Annand, J.R.M. (Glasgow U.) ; Arends, H.J. (Mainz U., Inst. Kernphys.) ; Beck, R. (Bonn U., HISKP) ; Borisov, N. (Dubna, JINR) ; Braghieri, A. (INFN, Pavia) ; Briscoe, W.J. (George Washington U.) ; Cividini, F. (Mainz U., Inst. Kernphys.) ; Collicott, C. (St. Mary's U., Halifax) ; Costanza, S. (Pavia U.) ; Denig, A. (Mainz U., Inst. Kernphys.) ; Downie, E.J. (George Washington U.) ; Dieterle, M. (Basel U.) ; Ferretti Bondy, M.I. (Mainz U., Inst. Kernphys.) ; Gardner, S. (Glasgow U.) ; Garni, S. (Basel U.) ; Glazier, D.I. (Edinburgh U.) ; Glowa, D. (Edinburgh U.) ; Gradl, W. (Mainz U., Inst. Kernphys.) ; Gurevich, G. (Moscow, INR) ; Hamilton, D.J. (Glasgow U.) ; Hornidge, D. (Mt. Allison U.) ; Huber, G.M. (Regina U.) ; Käser, A. (Basel U.) ; Kashevarov, V.L. (Dubna, JINR) ; Kay, S. (Edinburgh U.) ; Keshelashvili, I. (Basel U.) ; Kondratiev, R. (Moscow, INR) ; Korolija, M. (Boskovic Inst., Zagreb) ; Krusche, B. (Basel U.) ; Lazarev, A. (Dubna, JINR) ; Linturi, J. (Mainz U., Inst. Kernphys.) ; Livingston, K. (Glasgow U.) ; MacGregor, I.J.D. (Glasgow U.) ; Manley, D.M. (Kent State U. (main)) ; Martel, P.P. (Mt. Allison U.) ; McGeorge, J.C. (Glasgow U.) ; Middleton, D.G. (Mt. Allison U.) ; Miskimen, R. (Massachusetts U., Amherst) ; Mushkarenkov, A. (Massachusetts U., Amherst) ; Neganov, A. (Dubna, JINR) ; Neiser, A. (Mainz U., Inst. Kernphys.) ; Oberle, M. (Basel U.) ; Ostrick, M. (Mainz U., Inst. Kernphys.) ; Ott, P. (Mainz U., Inst. Kernphys.) ; Otte, P.B. (Mainz U., Inst. Kernphys.) ; Oussena, B. (George Washington U.) ; Paudyal, D. (Regina U.) ; Pedroni, P. (INFN, Pavia) ; Polonski, A. (Moscow, INR) ; Prakhov, S. (UCLA) ; Rajabi, A. (Massachusetts U., Amherst) ; Ron, G. (Hebrew U.) ; Rostomyan, T. (Basel U.) ; Sarty, A. (St. Mary's U., Halifax) ; Sfienti, C. (Mainz U., Inst. Kernphys.) ; Sokhoyan, V. (George Washington U.) ; Spieker, K. (Bonn U., HISKP) ; Steffen, O. (Mainz U., Inst. Kernphys.) ; Strakovsky, I.I. (George Washington U.) ; Strub, T. (Basel U.) ; Supek, I. (Boskovic Inst., Zagreb) ; Thiel, A. (Bonn U., HISKP) ; Thiel, M. (Mainz U., Inst. Kernphys.) ; Tiator, L. (Mainz U., Inst. Kernphys.) ; Thomas, A. (Mainz U., Inst. Kernphys.) ; Unverzagt, M. (Mainz U., Inst. Kernphys.) ; Usov, Y.A. (Dubna, JINR) ; Wagner, S. (Mainz U., Inst. Kernphys.) ; Watts, D.P. (Edinburgh U.) ; Werthmüller, D. (Basel U.) ; Wettig, J. (Mainz U., Inst. Kernphys.) ; Witthauer, L. (Basel U.) ; Wolfes, M. (Mainz U., Inst. Kernphys.) ; Workman, R.L. (George Washington U.) ; Zana, L.A. (Edinburgh U.)

Pages: 13

Abstract: An experimental study of the $\eta'\to \pi^0\pi^0\eta \to 6\gamma$ decay has been conducted with the best up-to-date statistical accuracy, by measuring $\eta'$ mesons produced in the $\gamma p \to \eta' p$ reaction with the A2 tagged-photon facilities at the Mainz Microtron, MAMI. The results obtained for the standard parametrization of the $\eta'\to \pi^0\pi^0\eta$ matrix element are consistent with the most recent results for $\eta'\to\pi\pi\eta$ decays, but have smaller uncertainties. The available statistics and experimental resolution allowed, for the first time, an observation of a structure below the $\pi^+\pi^-$ mass threshold, the magnitude and sign of which, checked within the framework of the nonrelativistic effective-field theory, demonstrated good agreement with the cusp that was predicted based on the $\pi\pi$ scattering length combination, $a_0-a_2$, extracted from $K \to 3\pi$ decays.

Web-Page: http://inspirehep.net/record/1623209/files/fig_DalitzPlots.png; http://inspirehep.net/record/1623209/files/fig_Fig_PDF_Meta2pi0.png; http://inspirehep.net/record/1623209/files/fig_332.png; http://inspirehep.net/record/1623209/files/fig_320.png; http://inspirehep.net/record/1623209/files/fig_DatadivPSY_KubisIsken.png; http://inspirehep.net/record/1623209/files/fig_DatadivPS.png; http://inspirehep.net/record/1623209/files/fig_DP_par.png; http://inspirehep.net/record/1623209/files/fig_CBTAPS.png; http://inspirehep.net/record/1623209/files/arXiv:1709.04230.pdf

Note: *Temporary entry*; 13 pages, 7 figures, 2 tables

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