Using a sample of (2.712 +/- 0.014) x 10(9)psi(3686) events collected with the BESIII detector at the electron positron collider BEPCII, the decay psi(3686) -> Xi K--(S)0(Omega) over bar (+) + 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) x 10(-6), where the first and second uncertainties are statistical and systematic, respectively. The ratio between B psi(3686)->Xi-KS0 (Omega) over bar++c.c and B psi(3686)->Omega-K+(Xi) over bar0+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 2.1 sigma.
Observation of ψ(3686) → Ξ-KS0(Ω)over-bar+ + c.c.
A. Amoroso;F. Bianchi;A. Bortone;M. Destefanis;F. De Mori;M. Greco;M. Maggiora;S. Marcello;S. Sosio;S. Spataro;
2025-01-01
Abstract
Using a sample of (2.712 +/- 0.014) x 10(9)psi(3686) events collected with the BESIII detector at the electron positron collider BEPCII, the decay psi(3686) -> Xi K--(S)0(Omega) over bar (+) + 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) x 10(-6), where the first and second uncertainties are statistical and systematic, respectively. The ratio between B psi(3686)->Xi-KS0 (Omega) over bar++c.c and B psi(3686)->Omega-K+(Xi) over bar0+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 2.1 sigma.| File | Dimensione | Formato | |
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JHEP06(2025)233.pdf
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