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η transition form factor: A combined analysis of space- and time-like experimental data through rational approximants

  • 1.

    Departament de Física, Universitat Autònoma de Barcelona, Grup de Física Teòorica E-08193 Bellaterra, Spain

  • 2.

    Institut de Física d'Altes Energies, The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra, Spain

Cite this: JUSTC, 2016, 46(6): 462-469
https://doi.org/10.3969/j.issn.0253-2778.2016.06.003
Funds: Supported in part by the the Ministerio de Ciencia e Innovación(FPA201125948), the Ministerio de Economíia y Competitividad(CICYT-FEDER-FPA 2014-55613-P, SEV-2012-0234), the Secretaria d'Universitats i Recerca del Departament d'Economia i Coneixement de la Generalitat de Catalunya(2014 SGR 1450), the Spanish Consolider-Ingenio 2010 Programme CPAN(CSD2007-00042)
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  • Published Date: June 29, 2016
    Abstract
  • A combined analysis of the space- and time-like experimental data for the η transition form factor is performed in a model-independent way by means of rational approximants. The recent measurement of the e+e- invariant mass spectrum of the η→e+e--γ decay provided by the A2 Collaboration allowed us to extract the most precise and up-to-date slope and curvature parameters of the form factor. The impact of this new analysis on the ηη′ mixing parameters and the VPγ couplings is also discussed.
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