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

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. Fil'Kov, A. Fix, D. I. GlazierR. Gregor, D. J. Hamilton, E. Heid, D. Hornidge, L. Isaksson, I. Jaegle, O. Jahn, T. C. Jude, V. L. Kashevarov, I. Keshelashvili, R. Kondratiev, M. Korolija, M. Kotulla, A. Koulbardis, S. Kruglov, B. Krusche, V. Lisin, K. Livingston, I. J.D. Macgregor, Y. Maghrbi, D. M. Manley, P. Masjuan, J. C. McGeorge, E. F. McNicoll, D. Mekterovic, V. Metag, A. Mushkarenkov, B. M.K. Nefkens, A. Nikolaev, R. Novotny, H. Ortega, M. Ostrick, P. Ott, P. B. Otte, B. Oussena, P. Pedroni, F. Pheron, A. Polonski, S. Prakhov, J. Robinson, G. Rosner, T. Rostomyan, S. Schumann, M. H. Sikora, D. I. Sober, A. Starostin, I. I. Strakovsky, I. M. Suarez, I. Supek, C. M. Tarbert, M. Thiel, A. Thomas, M. Unverzagt, D. P. Watts, D. Werthmüller, F. Zehr

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Abstract

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.

Original languageEnglish
Article number044608
JournalPhysical Review C - Nuclear Physics
Volume89
Issue number4
DOIs
Publication statusPublished - 17 Apr 2014

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form factors
balls
detectors
decay
crystals
marking
statistics
spectrometers
slopes
photons

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  • Nuclear and High Energy Physics

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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.; 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.; Zehr, F.

In: Physical Review C - Nuclear Physics, Vol. 89, No. 4, 044608, 17.04.2014.

Research output: Contribution to journalArticle

Aguar-Bartolomé, P, Annand, JRM, Arends, HJ, Bantawa, K, Beck, R, Bekrenev, V, Berghäuser, H, Braghieri, A, Briscoe, WJ, Brudvik, J, Cherepnya, S, Codling, RFB, Collicott, C, Costanza, S, Denig, A, Downie, EJ, Drexler, P, Fil'Kov, LV, Fix, A, Glazier, DI, Gregor, R, Hamilton, DJ, Heid, E, Hornidge, D, Isaksson, L, Jaegle, I, Jahn, O, Jude, TC, Kashevarov, VL, Keshelashvili, I, Kondratiev, R, Korolija, M, Kotulla, M, Koulbardis, A, Kruglov, S, Krusche, B, Lisin, V, Livingston, K, Macgregor, IJD, Maghrbi, Y, Manley, DM, Masjuan, P, McGeorge, JC, McNicoll, EF, Mekterovic, D, Metag, V, Mushkarenkov, A, Nefkens, BMK, Nikolaev, A, Novotny, R, Ortega, H, Ostrick, M, Ott, P, Otte, PB, Oussena, B, Pedroni, P, Pheron, F, Polonski, A, Prakhov, S, Robinson, J, Rosner, G, Rostomyan, T, Schumann, S, Sikora, MH, Sober, DI, Starostin, A, Strakovsky, II, Suarez, IM, Supek, I, Tarbert, CM, Thiel, M, Thomas, A, Unverzagt, M, Watts, DP, Werthmüller, D & Zehr, F 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 - Nuclear Physics, vol. 89, no. 4, 044608. https://doi.org/10.1103/PhysRevC.89.044608
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. ; Zehr, F. / 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. In: Physical Review C - Nuclear Physics. 2014 ; Vol. 89, No. 4.
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abstract = "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.",
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AU - Aguar-Bartolomé, P.

AU - Annand, J. R.M.

AU - Arends, H. J.

AU - Bantawa, K.

AU - Beck, R.

AU - Bekrenev, V.

AU - Berghäuser, H.

AU - Braghieri, A.

AU - Briscoe, W. J.

AU - Brudvik, J.

AU - Cherepnya, S.

AU - Codling, R. F.B.

AU - Collicott, C.

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AU - Denig, A.

AU - Downie, E. J.

AU - Drexler, P.

AU - Fil'Kov, L. V.

AU - Fix, A.

AU - Glazier, D. I.

AU - Gregor, R.

AU - Hamilton, D. J.

AU - Heid, E.

AU - Hornidge, D.

AU - Isaksson, L.

AU - Jaegle, I.

AU - Jahn, O.

AU - Jude, T. C.

AU - Kashevarov, V. L.

AU - Keshelashvili, I.

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AU - Masjuan, P.

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AU - Polonski, A.

AU - Prakhov, S.

AU - Robinson, J.

AU - Rosner, G.

AU - Rostomyan, T.

AU - Schumann, S.

AU - Sikora, M. H.

AU - Sober, D. I.

AU - Starostin, A.

AU - Strakovsky, I. I.

AU - Suarez, I. M.

AU - Supek, I.

AU - Tarbert, C. M.

AU - Thiel, M.

AU - Thomas, A.

AU - Unverzagt, M.

AU - Watts, D. P.

AU - Werthmüller, D.

AU - Zehr, F.

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