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    Eta photoproduction as a test of the extended chiral symmetry

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    5 pages, 1 table, 3 figures.--PACS nrs.: 11.30.Rd; 13.60.Le; 14.20.Gk; 25.20.Lj.--Printed version published on August 9, 2007.--ArXiv pre-print available at: http://arxiv.org/abs/0706.0616v1We analyze the γp→ηp process from threshold up to 1.2 GeV, employing an effective Lagrangian approach that allows for a mixing of eta couplings of pseudoscalar and pseudovector nature. The mixing ratio of the couplings may serve as a quantitative estimation of the SUL(3)×SUR(3) extended chiral symmetry violation in this energy regime. The data analyzed (differential cross sections and asymmetries) show a preference for the pseudoscalar coupling—91% of pseudoscalar coupling component for the best fit. We stress that a more conclusive answer to this question requires a more complete electromagnetic multipole database than the presently available one.This work has been supported in part under contracts FIS2005-00640 and FPA2006-07393 of Ministerio de Educación y Ciencia (Spain) and by UCM and Comunidad de Madrid under project number 910059 (Grupo de Física Nuclear).Peer reviewe
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