Measurement of the branching fractions for J/ψ→pp¯η and pp¯η′

M. Ablikim,J.Z. Bai, Y. Bai, Y. Ban, X. Cai,H.F. Chen,H.S. Chen,H.X. Chen,J.C. Chen,Jin Chen,X.D. Chen,Y.B. Chen,Y.P. Chu,Y.S. Dai,Z.Y. Deng,S.X. Du, J. Fang, C.D. Fu,C.S. Gao, Y.N. Gao

Physics Letters B（2009）

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摘要

Using 58×106 J/ψ events collected with the Beijing Spectrometer (BESII) at the Beijing Electron Positron Collider (BEPC), the branching fractions of J/ψ to pp¯η and pp¯η′ are determined. The ratio Γ(J/ψ→pp¯η)Γ(J/ψ→pp¯) obtained by this analysis agrees with expectations based on soft-pion theorem calculations.

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