Measurement of J/ ψ decays into final states 2(π+π-)π0,K+K-π+π-π0,2(π+π-) and K+K-π+π-

Abstract

Using the 1.32 pb - 1 statistics collected at the J/ ψ peak with the KEDR detector at the VEPP-4M e+e-collider, we measured the branching fractions of J/ ψ meson decays to the final states 2(π+π-) π, K+K-π+π-π, 2(π+π-) and K+K-π+π-. The results obtained for the decays J/ ψ→ 2(π+π-) π, J/ ψ→ K+K-π+π-π contradict the measurements performed by other groups in the last century, but agree well with recent results of BABAR and BESIII collaborations.