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

Nefkens, B. M.K. et al. (2014) New measurement of the rare decay η→π0γγ with the Crystal Ball/TAPS detectors at the Mainz Microtron. Physical Review C, 90(2), 025206. (doi: 10.1103/PhysRevC.90.025206)

Abstract

A new measurement of the rare, doubly radiative decay η→π0γγ 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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Glazier, Dr Derek and Robinson, Mr Jamie and MacGregor, Professor Douglas and Livingston, Dr Kenneth and Howdle, Mr David and McNicoll, Miss Eilidh and Hamilton, Dr David and Rosner, Professor Guenther
• Authors: 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., Dieterle, M., Downie, E.J., Drexler, P., Fil'kov, L.V., Fix, A., Garni, S., Glazier, D.I., Gregor, R., Hamilton, D., Heid, E., Hornidge, D., Howdle, D., Jahn, O., Jude, T.C., Kashevarov, V.L., Käser, A., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I.J.D., Maghrbi, Y., Mancel, J., Manley, D.M., McNicoll, E.F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nikolaev, A., Novotny, R., Oberle, M., Ortega, H., Ostrick, M., Ott, P., Otte, P.B., Oussena, B., Pedroni, P., Polonski, A., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M.H., Starostin, A., Strakovsky, I.I., Strub, T., Suarez, I.M., Supek, I., Tarbert, C.M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D.P., Werthmüller, D., and Witthauer, L.
• 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
• Copyright Holders: Copyright © 2014 American Physical Society
• First Published: First published in Physical Review C 90(2):025206
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher.