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-Bartolome P.
- Annand J. R. M.
- Arends H. J.
- Bantawa K.
- Beck R.
- Bekrenev V.
- Berghauser 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.
- Werthmuller D.
- Zehr F.
Publication date
January 2014
DOIAbstract
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. © 2014 American Physical Society
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