Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-06-05
Phys.Lett.B651:369-373,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
Accepted for publication in Physics Letters B, 1 table, 3 figures
Scientific paper
10.1016/j.physletb.2007.06.049
We analyze the $\gamma p \to \eta p$ 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 $SU_L(3)\times SU_R(3)$ 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.
de Guerra Moya E.
Fernandez-Ramirez C.
Udias J. M.
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