Using a sample of (2.712 ± 0.014) × 109ψ(3686) events collected with the BESIII detector at the electron positron collider BEPCII, the decay ψ(3686) → Ξ−KS0Ω¯+ + c.c. is observed for the first time, which has a significance of 5.9 standard deviations. The branching fraction of this decay is measured to be (2.91 ± 0.47 ± 0.33) × 10−6, where the first and second uncertainties are statistical and systematic, respectively. The ratio between Bψ3686→Ξ−KS0Ω¯++c.c and Bψ3686→Ω−K+Ξ¯0+c.c is determined to be 1.05 ± 0.23 ± 0.14, which deviates from the isospin symmetry conservation predicted value of 0.5 by 2.1σ.

Observation of ψ(3686) → Ξ-KS0(Ω)over-bar+ + c.c.

Bettoni, D.;Cibinetto, G.;Garzia, I.;Gramigna, S.;Melendi, F. M.;Mezzadri, G.;
2025

Abstract

Using a sample of (2.712 ± 0.014) × 109ψ(3686) events collected with the BESIII detector at the electron positron collider BEPCII, the decay ψ(3686) → Ξ−KS0Ω¯+ + c.c. is observed for the first time, which has a significance of 5.9 standard deviations. The branching fraction of this decay is measured to be (2.91 ± 0.47 ± 0.33) × 10−6, where the first and second uncertainties are statistical and systematic, respectively. The ratio between Bψ3686→Ξ−KS0Ω¯++c.c and Bψ3686→Ω−K+Ξ¯0+c.c is determined to be 1.05 ± 0.23 ± 0.14, which deviates from the isospin symmetry conservation predicted value of 0.5 by 2.1σ.
2025
Null, Null; Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, Q.; Bai, Y.; Bakina, O.; Ban, Y.; Bao, H. -R.; Batozs...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2600811
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