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New determination of the eta transition form factor in the Dalitz decay eta -> e(+) e(-) gamma 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.; Berghaeuser, H.; Braghieri, A.; Briscoe, W. J. and Brudvik, J., et al. (2014) In Physical Review C (Nuclear Physics) 89(4).
Abstract
The Dalitz decay eta -> e(+) e(-) gamma has been measured in the gamma p -> 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 eta -> e(+) e(-) gamma. The value obtained for the slope parameter Lambda(-2) of the eta transition form factor, Lambda(-2) = (1.95 +/- 0.15(stat) +/- 0.10(syst)) GeV-2, is in good agreement with recent measurements conducted in eta -> e(+) e(-) gamma and eta -> mu(+) mu(-) gamma decays, as well as with recent form-factor calculations. The uncertainty obtained in the value of Lambda(-2) is lower... (More)
The Dalitz decay eta -> e(+) e(-) gamma has been measured in the gamma p -> 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 eta -> e(+) e(-) gamma. The value obtained for the slope parameter Lambda(-2) of the eta transition form factor, Lambda(-2) = (1.95 +/- 0.15(stat) +/- 0.10(syst)) GeV-2, is in good agreement with recent measurements conducted in eta -> e(+) e(-) gamma and eta -> mu(+) mu(-) gamma decays, as well as with recent form-factor calculations. The uncertainty obtained in the value of Lambda(-2) is lower compared to results from previous measurements of the eta -> e(+) e(-) gamma decay. (Less)
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Physical Review C (Nuclear Physics)
volume
89
issue
4
publisher
American Physical Society
external identifiers
  • wos:000334595900002
  • scopus:84899673170
ISSN
0556-2813
DOI
10.1103/PhysRevC.89.044608
language
English
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2014-06-26 09:30:51
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@article{7ccebe9f-12c2-4d57-8f7a-b7ac557f3602,
  abstract     = {The Dalitz decay eta -> e(+) e(-) gamma has been measured in the gamma p -> 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 eta -> e(+) e(-) gamma. The value obtained for the slope parameter Lambda(-2) of the eta transition form factor, Lambda(-2) = (1.95 +/- 0.15(stat) +/- 0.10(syst)) GeV-2, is in good agreement with recent measurements conducted in eta -> e(+) e(-) gamma and eta -> mu(+) mu(-) gamma decays, as well as with recent form-factor calculations. The uncertainty obtained in the value of Lambda(-2) is lower compared to results from previous measurements of the eta -> e(+) e(-) gamma decay.},
  articleno    = {044608},
  author       = {Aguar-Bartolome, P. and Annand, J. R. M. and Arends, H. J. and Bantawa, K. and Beck, R. and Bekrenev, V. and Berghaeuser, H. and Braghieri, A. and Briscoe, W. J. and Brudvik, J. and Cherepnya, S. and Codling, R. F. B. and Collicott, C. and Costanza, S. and Denig, A. and Downie, E. J. and Drexler, P. and Fil'kov, L. V. and Fix, A. and Glazier, D. I. and Gregor, R. and Hamilton, D. J. and Heid, E. and Hornidge, D. and Isaksson, Lennart and Jaegle, I. and Jahn, O. and Jude, T. C. and Kashevarov, V. L. and Keshelashvili, I. and Kondratiev, R. and Korolija, M. and Kotulla, M. and Koulbardis, A. and Kruglov, S. and Krusche, B. and Lisin, V. and Livingston, K. and MacGregor, I. J. D. and Maghrbi, Y. and Manley, D. M. and Masjuan, P. and McGeorge, J. C. and McNicoll, E. F. and Mekterovic, D. and Metag, V. and Mushkarenkov, A. and Nefkens, B. M. K. and Nikolaev, A. and Novotny, R. and Ortega, H. and Ostrick, M. and Ott, P. and Otte, P. B. and Oussena, B. and Pedroni, P. and Pheron, F. and Polonski, A. and Prakhov, S. and Robinson, J. and Rosner, G. and Rostomyan, T. and Schumann, S. and Sikora, M. H. and Sober, D. I. and Starostin, A. and Strakovsky, I. I. and Suarez, I. M. and Supek, I. and Tarbert, C. M. and Thiel, M. and Thomas, A. and Unverzagt, M. and Watts, D. P. and Werthmueller, D. and Zehr, F.},
  issn         = {0556-2813},
  language     = {eng},
  number       = {4},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {New determination of the eta transition form factor in the Dalitz decay eta -> e(+) e(-) gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron},
  url          = {http://dx.doi.org/10.1103/PhysRevC.89.044608},
  volume       = {89},
  year         = {2014},
}