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High-statistics measurement of the η→3π0 decay at the Mainz Microtron

S. Prakhov1,2,*, S. Abt3, P. Achenbach1, P. Adlarson1, F. Afzal4, P. Aguar-Bartolomé1, Z. Ahmed5, J. Ahrens1, J. R. M. Annand6 et al. (A2 Collaboration at MAMI)

J. R. M. Annand6, H. J. Arends1, K. Bantawa7, M. Bashkanov8, R. Beck4, M. Biroth1, N. S. Borisov9, A. Braghieri10, W. J. Briscoe11, S. Cherepnya12, F. Cividini1, C. Collicott13,14, S. Costanza10,15, A. Denig1, M. Dieterle3, E. J. Downie11, P. Drexler1, M. I. Ferretti Bondy1, L. V. Fil'kov12, A. Fix16, S. Gardner6, S. Garni3, D. I. Glazier6,8, I. Gorodnov9, W. Gradl1, G. M. Gurevich17, C. B. Hamill8, L. Heijkenskjöld1, D. Hornidge18, G. M. Huber5, A. Käser3, V. L. Kashevarov1,9, S. Kay8, I. Keshelashvili3, R. Kondratiev17, M. Korolija19, B. Krusche3, A. Lazarev9, V. Lisin17, K. Livingston6, S. Lutterer3, I. J. D. MacGregor6, D. M. Manley7, P. P. Martel1,18, J. C. McGeorge6, D. G. Middleton1,18, R. Miskimen20, E. Mornacchi1, A. Mushkarenkov10,20, A. Neganov9, A. Neiser1, M. Oberle3, M. Ostrick1, P. B. Otte1, D. Paudyal5, P. Pedroni10, A. Polonski17, G. Ron21, T. Rostomyan3, A. Sarty14, C. Sfienti1, V. Sokhoyan1, K. Spieker4, O. Steffen1, I. I. Strakovsky11, B. Strandberg6, Th. Strub3, I. Supek19, A. Thiel4, M. Thiel1, A. Thomas1, M. Unverzagt1, Yu. A. Usov9, S. Wagner1, N. K. Walford3, D. P. Watts8, D. Werthmüller3,6, J. Wettig1, L. Witthauer3, M. Wolfes1, and L. A. Zana8 (A2 Collaboration at MAMI)

  • 1Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
  • 2University of California Los Angeles, Los Angeles, California 90095-1547, USA
  • 3Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
  • 4Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115 Bonn, Germany
  • 5University of Regina, Regina, Saskatchewan S4S 0A2, Canada
  • 6SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
  • 7Kent State University, Kent, Ohio 44242-0001, USA
  • 8School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
  • 9Joint Institute for Nuclear Research, 141980 Dubna, Russia
  • 10INFN Sezione di Pavia, I-27100 Pavia, Italy
  • 11The George Washington University, Washington, DC 20052-0001, USA
  • 12Lebedev Physical Institute, 119991 Moscow, Russia
  • 13Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada
  • 14Saint Marys University, Halifax, Nova Scotia B3H 3C3, Canada
  • 15Dipartimento di Fisica, Università di Pavia, I-27100 Pavia, Italy
  • 16Laboratory of Mathematical Physics, Tomsk Polytechnic University, 634034 Tomsk, Russia
  • 17Institute for Nuclear Research, 125047 Moscow, Russia
  • 18Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada
  • 19Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia
  • 20University of Massachusetts, Amherst, Massachusetts 01003, USA
  • 21Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel

  • *prakhov@ucla.edu
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Phys. Rev. C 97, 065203 – Published 7 June, 2018

DOI: https://doi.org/10.1103/PhysRevC.97.065203

Abstract

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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Phys. Rev. C 97, 065203– Published 7 June, 2018
  • Received 7 March 2018
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