Eta photoproduction as a test of the extended chiral symmetry
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- 作者：C. Ferná ; ndez-Ramí ; rez ; E. Moya de Guerra ; J.M. Udí ; as
- 关键词：Extended chiral symmetry ; Eta photoproduction
- 刊名：Physics Letters B
- 出版年：2007
- 出版时间：9 August 2007
- 年：2007
- 卷：651
- 期：5-6
- 页码：369-373
- 全文大小：159 K
文摘
We analyze the 710054d6a5ab1481b"" title=""Click to view the MathML source"">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.