Strong and Weak C P Tests in Sequential Decays of Polarized Σ 0 Hyperons

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doi:10.1103/PhysRevLett.133.101902

Title: Strong and Weak $C P$ Tests in Sequential Decays of Polarized $Σ^{0}$ Hyperons

Journal Article · 04 September 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.133.101902 · OSTI ID:2439637

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Afedulidis, O.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, H. -R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F. more »

The $J / ψ$ , $ψ (3686) \to Σ^{0} {\bar{Σ}}^{0}$ processes and subsequent decays are studied using the world’s largest $J / ψ$ and $ψ (3686)$ data samples collected with the BESIII detector. The parity-violating decay parameters of the decays $Σ^{0} \to Λ γ$ and ${\bar{Σ}}^{0} \to \bar{Λ} γ$ , $α_{Σ^{0}} = - 0.0017 \pm 0.0021 \pm 0.0018$ and ${\bar{α}}_{Σ^{0}} = 0.0021 \pm 0.0020 \pm 0.0022$ , are measured for the first time. The strong $C P$ symmetry is tested in the decays of the $Σ^{0}$ hyperons for the first time by measuring the asymmetry $A_{C P}^{Σ} = α_{Σ^{0}} + {\bar{α}}_{Σ^{0}} = (0.4 \pm 2.9 \pm 1.3) \times 10^{- 3}$ . The weak $C P$ test is performed in the subsequent decays of their daughter particles $Λ$ and $\bar{Λ}$ . Also for the first time, the transverse polarizations of the $Σ^{0}$ hyperons in $J / ψ$ and $ψ (3686)$ decays are observed with opposite directions, and the ratios between the $S$ -wave and $D$ -wave contributions of the $J / ψ$ , $ψ (3686) \to Σ^{0} {\bar{Σ}}^{0}$ decays are obtained. These results are crucial to understand the decay dynamics of the charmonium states and the production mechanism of the $Σ^{0} - {\bar{Σ}}^{0}$ pairs. Published by the American Physical Society 2024

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Research Organization:: Indiana Univ., Bloomington, IN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2439637

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 133; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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