New determination of the η transition form factor in the Dalitz decay η→e+e−γ with the Crystal Ball/TAPS detectors at the Mainz Microtron

Aguar-Bartolomé, P. et al. (2014) New determination of the η transition form factor in the Dalitz decay η→e+e−γ with the Crystal Ball/TAPS detectors at the Mainz Microtron. Physical Review C, 89(4), 044608. (doi: 10.1103/PhysRevC.89.044608)

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The Dalitz decay η→e+e−γ has been measured in the γp→ηp reaction with the Crystal Ball and TAPS multiphoton spectrometers, together with the photon-tagging facility at the Mainz Microtron MAMI. The experimental statistic used in this work is one order of magnitude greater than in any previous measurement of η→e+e−γ. The value obtained for the slope parameter Λ−2 of the η transition form factor, Λ−2=(1.95±0.15stat±0.10syst) GeV−2, is in good agreement with recent measurements conducted in η→e+e−γ and η→μ+μ−γ decays, as well as with recent form-factor calculations. The uncertainty obtained in the value of Λ−2 is lower compared to results from previous measurements of the η→e+e−γ decay.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Glazier, Dr Derek and McGeorge, Dr John and Robinson, Mr Jamie and MacGregor, Professor Douglas and Livingston, Dr Kenneth and Codling, Mr Richard and McNicoll, Miss Eilidh and Annand, Dr John and Hamilton, Dr David and Rosner, Professor Guenther
Authors: 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., Denig, A., Downie, E. J., Drexler, P., Fil'kov, L. V., Fix, A., Glazier, D. I., Gregor, R., Hamilton, D. J., Heid, E., Hornidge, D., Isaksson, L., Jaegle, I., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Koulbardis, A., Kruglov, S., Krusche, B., Lisin, V., Livingston, K., MacGregor, I. J. D., Maghrbi, Y., Manley, D. M., Masjuan, P., McGeorge, J. C., McNicoll, E. F., Mekterovic, D., Metag, V., Mushkarenkov, A., Nefkens, B. M. K., Nikolaev, A., Novotny, R., Ortega, H., Ostrick, M., Ott, P., Otte, P. B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Sober, D. I., Starostin, A., Strakovsky, I. I., Suarez, I. M., Supek, I., Tarbert, C. M., Thiel, M., Thomas, A., Unverzagt, M., Watts, D. P., Werthmüller, D., and Zehr, F.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review C
Publisher:American Physical Society
ISSN (Online):1089-490X

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