By analyzing(10087 ± 44)x 106 J/ψ events collected with the BESIII detector at the BEPCII, the decays J/ψ → Ξ0Λ¯K0S+c.c., J/ψ →Ξ0Σ¯0K0S+c.c., J/ψ → Ξ0Σ¯−K++c.c. and are observed for the first time. Their branching fractions are determined to be B(J/ψ → Ξ0Λ¯K0S+c.c.) = (3.76 ± 0.14 ± 0.23)x10-5, B(J/ψ →Ξ0Σ¯0K0S+c.c.) = (2.24 ± 0.32 ± 0.31)x10-5, and B(J/ψ → Ξ0Σ¯−K++c.c.) = (5.64 ± 0.17 ± 0.28)x10-5, where the first uncertainties are statistical and the second systematic.
First measurements of the branching fractions of J/ψ → Ξ0Λ¯K0S+c.c., J/ψ →Ξ0Σ¯0K0S+c.c., J/ψ → Ξ0Σ¯−K++c.c.
Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Rong, G.;Sosio, S.;Spataro, S.;
2025-01-01
Abstract
By analyzing(10087 ± 44)x 106 J/ψ events collected with the BESIII detector at the BEPCII, the decays J/ψ → Ξ0Λ¯K0S+c.c., J/ψ →Ξ0Σ¯0K0S+c.c., J/ψ → Ξ0Σ¯−K++c.c. and are observed for the first time. Their branching fractions are determined to be B(J/ψ → Ξ0Λ¯K0S+c.c.) = (3.76 ± 0.14 ± 0.23)x10-5, B(J/ψ →Ξ0Σ¯0K0S+c.c.) = (2.24 ± 0.32 ± 0.31)x10-5, and B(J/ψ → Ξ0Σ¯−K++c.c.) = (5.64 ± 0.17 ± 0.28)x10-5, where the first uncertainties are statistical and the second systematic.
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