Abstract
U-spin symmetry ( s ↔ d symmetry) forbids the radiative decay Ξ c2 0∗ a ̊ Ξ c1 0γ in the SU(3) limit. The quark mass term breaks U-spin symmetry and the leading nonanalytic contribution to the radiative decay amplitude is computable in heavy baryon chiral perturbation theory. The radiative decay branching ratio is determined by the coupling constant g 2 and at leading order in chiral perturbation theory is given by Br c2(Ξ 0∗ a ̊ Ξ c1 0γ) = 1.0 × 10 −3g 2 2 . Measurement of this branching fraction will determine ∥ g 2∥.
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