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New determination of theηtransition form factor in the Dalitz decayη→e+e−γwith the Crystal Ball/TAPS detectors at the Mainz Microtron

Physical Review C2014Vol. 89(4)

Citations Over TimeTop 10% of 2014 papers

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, A. Denig, E. J. Downie, P. Drexler, L.V. Filʼkov, A. Fix, D. I. Glazier, R. Gregor, D. Hamilton, E. Heid, D. Hornidge, L. Isaksson, I. Jaeglé, Oliver Jahn, T. C. Jude, V. L. Kashevarov, I. Keshelashvili, R. Kondratiev, M. Korolija, M. Kotulla, A. Koulbardis, S. P. Kruglov, B. Krusche, V. Lisin, K. Livingston, I. J. D. MacGregor, Y. Maghrbi, D. M. Manley, Pere Masjuan, J. C. McGeorge, E. F. McNicoll, D. Mekterović, V. Metag, A. Mushkarenkov, B. M. K. Nefkens, А. Г. Николаев, R. Novotny, H. Ortega, M. Ostrick, P. S. Ott, P. B. Otte, B. Oussena, P. Pedroni, F. Pheron, A. Polonski, S. Prakhov, J. E. M. Robinson, G. Rosner, T. Rostomyan, Sven Schumann, M. H. Sikora, D. I. Sober, A. Starostin, I. I. Strakovsky, I. Suarez, I. Supek, C. M. Tarbert, M. Thiel, A. W. Thomas, M. Unverzagt, D. P. Watts, D. Werthmüller, F. Zehr

Abstract

The Dalitz decay $\ensuremath{\eta}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}\ensuremath{\gamma}$ has been measured in the $\ensuremath{\gamma}p\ensuremath{\rightarrow}\ensuremath{\eta}p$ 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 $\ensuremath{\eta}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}\ensuremath{\gamma}$. The value obtained for the slope parameter ${\ensuremath{\Lambda}}^{\ensuremath{-}2}$ of the $\ensuremath{\eta}$ transition form factor, ${\ensuremath{\Lambda}}^{\ensuremath{-}2}=(1.95\ifmmode\pm\else\textpm\fi{}0.{15}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}0.{10}_{\mathrm{syst}})$ GeV${}^{\ensuremath{-}2}$, is in good agreement with recent measurements conducted in $\ensuremath{\eta}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}\ensuremath{\gamma}$ and $\ensuremath{\eta}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}\ensuremath{\gamma}$ decays, as well as with recent form-factor calculations. The uncertainty obtained in the value of ${\ensuremath{\Lambda}}^{\ensuremath{-}2}$ is lower compared to results from previous measurements of the $\ensuremath{\eta}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}\ensuremath{\gamma}$ decay.

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Abstract

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