New measurement of the rare decay η→π0γγ with the Crystal Ball/TAPS detectors at the Mainz Microtron

B. M K Nefkens, S. Prakhov, P. Aguar-Bartolomé, J. R M Annand, H. J. Arends, K. Bantawa, R. Beck, V. Bekrenev, H. Berghäuser, A. Braghieri, W. J. Briscoe, J. Brudvik, S. Cherepnya, R. F B Codling, C. Collicott, S. Costanza, I. V. Danilkin, A. Denig, B. Demissie, M. DieterleE. J. Downie, P. Drexler, L. V. Fil'Kov, A. Fix, S. Garni, D. I. Glazier, R. Gregor, D. Hamilton, E. Heid, D. Hornidge, D. Howdle, O. Jahn, T. C. Jude, V. L. Kashevarov, A. Käser, I. Keshelashvili, R. Kondratiev, M. Korolija, M. Kotulla, A. Koulbardis, S. Kruglov, B. Krusche, V. Lisin, K. Livingston, I. J D Macgregor, Y. Maghrbi, J. Mancel, D. M. Manley, E. F. McNicoll, D. Mekterovic, V. Metag, A. Mushkarenkov, A. Nikolaev, R. Novotny, M. Oberle, H. Ortega, M. Ostrick, P. Ott, P. B. Otte, B. Oussena, P. Pedroni, A. Polonski, J. Robinson, G. Rosner, T. Rostomyan, S. Schumann, M. H. Sikora, A. Starostin, I. I. Strakovsky, T. Strub, I. M. Suarez, I. Supek, C. M. Tarbert, M. Thiel, A. Thomas, M. Unverzagt, D. P. Watts, D. Werthmüller, L. Witthauer

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

A new measurement of the rare, doubly radiative decay η→π 0γγ was conducted with the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. New data on the dependence of the partial decay width, Γ(η→π0γγ), on the two-photon invariant-mass squared, m2(γγ), as well as a new, more precise value for the decay width, Γ(η→π0γγ)=(0.33±0.03tot) eV, are based on analysis of 1.2×103η→π0γγ decays from a total of 6×107η mesons produced in the γp→ηp reaction. The present results for dΓ(η→π0γγ)/ dm2(γγ) are in good agreement with previous measurements and recent theoretical calculations for this dependence.

Original languageEnglish
Article number025206
JournalPhysical Review C - Nuclear Physics
Volume90
Issue number2
DOIs
Publication statusPublished - 14 Aug 2014

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Fingerprint Dive into the research topics of 'New measurement of the rare decay η→π0γγ with the Crystal Ball/TAPS detectors at the Mainz Microtron'. Together they form a unique fingerprint.

  • Cite this

    Nefkens, B. M. K., Prakhov, S., Aguar-Bartolomé, P., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Collicott, C., Costanza, S., Danilkin, I. V., Denig, A., Demissie, B., ... Witthauer, L. (2014). New measurement of the rare decay η→π0γγ with the Crystal Ball/TAPS detectors at the Mainz Microtron. Physical Review C - Nuclear Physics, 90(2), [025206]. https://doi.org/10.1103/PhysRevC.90.025206