Fernández Ramírez, CésarMoya de Guerra, E.Udías, J. M.2024-12-092024-12-092007-08-09Fernández-Ramírez, Moya de Guerra, & Udías. (2007). Eta photoproduction as a test of the extended chiral symmetry. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 651(5-6), 369-373. https://doi.org/10.1016/J.PHYSLETB.2007.06.0490370-2693https://doi.org/10.1016/j.physletb.2007.06.049https://hdl.handle.net/20.500.14468/24761This is an Accepted Manuscript of an article published by Elsevier in "Physics Letters B, Volume 651(5-6), 369-373", available at: https://doi.org/10.1016/j.physletb.2007.06.049Este es el manuscrito aceptado del artículo publicado por Elsevier en "Physics Letters B, Volumen 651(5-6), 369-373", disponible en línea: https://doi.org/10.1016/j.physletb.2007.06.049We 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.eninfo:eu-repo/semantics/openAccessartículoExtended chiral symmetryEta photoproduction