Dalitz analysis of B→Kπ+ψ′ decays and the Z(4430)

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Using (2712.4±14.3)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, the decay ηc→γγ in J/ψ→γηc is observed. We determine the product branching fraction B(J/ψ→γηc)×B(ηc→γγ)=(5.23±0.26stat±0.30syst)×10-6. This result is consiste ...

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Dalitz analysis of B→Kπ+ψ′ decays and the Z(4430)

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