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Título

Eta photoproduction as a test of the extended chiral symmetry

AutorFernández-Ramírez, César ; Moya de Guerra, Elvira ; Udías, J.M.
Palabras claveExtended chiral symmetry
Eta photoproduction
[PACS] Chiral symmetries
[PACS] Meson production
[PACS] Baryon resonances with S=0
[PACS] Photoproduction reactions
Fecha de publicación27-jun-2007
EditorElsevier
CitaciónPhysics Letters B 651(5-6): 369–373 (2007)
ResumenWe 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.
Descripción5 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/0706.0616v1
Versión del editorhttp://dx.doi.org/10.1016/j.physletb.2007.06.049
URIhttp://hdl.handle.net/10261/15943
DOI10.1016/j.physletb.2007.06.049
ISSN0370-2693
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