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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

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Author

  • P. Aguar-Bartolome
  • J. R. M. Annand
  • H. J. Arends
  • K. Bantawa
  • R. Beck
  • V. Bekrenev
  • H. Berghaeuser
  • 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. Glazier
  • R. Gregor
  • D. J. Hamilton
  • E. Heid
  • D. Hornidge
  • Lennart 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. Werthmueller
  • F. Zehr
Show all

Summary, in English

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.

Department/s

Publishing year

2014

Language

English

Publication/Series

Physical Review C (Nuclear Physics)

Volume

89

Issue

4

Document type

Journal article

Publisher

American Physical Society

Topic

  • Physical Sciences
  • Natural Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 0556-2813