Based on $(2712.4 \pm 14.3)\times10^{6}$ $\psi(3686)$ events collected with the BESIII detector, the decays $\Xi(1530)^- \to \Xi^0\pi^-$ and $\Xi(1530)^- \to \Xi^-\pi^0$ are investigated jointly via the process $\psi(3686)\to\bar{\Xi}^+\Xi(1530)^-+\mathrm{c.c.}$ Assuming isospin symmetry, the two decay modes are treated as fully correlated, and we report the first measurement of their absolute branching fractions. The results are $$\mathcal{B}(\Xi(1530)^-\to\Xi^0\pi^-)=(61.4 \pm 4.5\,(\mathrm{stat}) \pm 4.6\,(\mathrm{syst}))\%,$$ and $$\mathcal{B}(\Xi(1530)^-\to\Xi^-\pi^0)=(29.7 \pm 2.2\,(\mathrm{stat}) \pm 2.2\,(\mathrm{syst}))\%.$$ The combined branching fraction of the two decays is $$\mathcal{B}(\Xi(1530)^-\to(\Xi\pi)^-)=(91.1 \pm 6.7\,(\mathrm{stat}) \pm 6.8\,(\mathrm{syst}))\%,$$ where the uncertainties account for the correlations between the two modes. Here, the first uncertainties are statistical and the second are systematic. In addition, we update the branching fraction of the decay $\psi(3686)\to\bar{\Xi}^+\Xi(1530)^-+\mathrm{c.c.}$, obtaining $$\mathcal{B}(\psi(3686)\to\bar{\Xi}^+\Xi(1530)^-+\mathrm{c.c.})=(8.67 \pm 0.52\,(\mathrm{stat}) \pm 0.58\,(\mathrm{syst}) \pm 0.57\,(\mathrm{int}))\times10^{-6},$$ where the first uncertainty is statistical, the second is systematic (related to event selection and the fit model), and the third is associated with the interference effect.

Measurement of the absolute branching fraction of Ξ(1530) − → (Ξπ) − and updated measurement of the branching fraction of ψ(3686) → Ξ¯ +Ξ(1530) − + c:c:

Di Fiore, E.;Garzia, I.;Melendi, F.  M.;
2026

Abstract

Based on $(2712.4 \pm 14.3)\times10^{6}$ $\psi(3686)$ events collected with the BESIII detector, the decays $\Xi(1530)^- \to \Xi^0\pi^-$ and $\Xi(1530)^- \to \Xi^-\pi^0$ are investigated jointly via the process $\psi(3686)\to\bar{\Xi}^+\Xi(1530)^-+\mathrm{c.c.}$ Assuming isospin symmetry, the two decay modes are treated as fully correlated, and we report the first measurement of their absolute branching fractions. The results are $$\mathcal{B}(\Xi(1530)^-\to\Xi^0\pi^-)=(61.4 \pm 4.5\,(\mathrm{stat}) \pm 4.6\,(\mathrm{syst}))\%,$$ and $$\mathcal{B}(\Xi(1530)^-\to\Xi^-\pi^0)=(29.7 \pm 2.2\,(\mathrm{stat}) \pm 2.2\,(\mathrm{syst}))\%.$$ The combined branching fraction of the two decays is $$\mathcal{B}(\Xi(1530)^-\to(\Xi\pi)^-)=(91.1 \pm 6.7\,(\mathrm{stat}) \pm 6.8\,(\mathrm{syst}))\%,$$ where the uncertainties account for the correlations between the two modes. Here, the first uncertainties are statistical and the second are systematic. In addition, we update the branching fraction of the decay $\psi(3686)\to\bar{\Xi}^+\Xi(1530)^-+\mathrm{c.c.}$, obtaining $$\mathcal{B}(\psi(3686)\to\bar{\Xi}^+\Xi(1530)^-+\mathrm{c.c.})=(8.67 \pm 0.52\,(\mathrm{stat}) \pm 0.58\,(\mathrm{syst}) \pm 0.57\,(\mathrm{int}))\times10^{-6},$$ where the first uncertainty is statistical, the second is systematic (related to event selection and the fit model), and the third is associated with the interference effect.
2026
Ablikim, M.; Achasov, M.  n.; Adlarson, P.; Ai, X.  c.; Akondi, C.  s.; Aliberti, R.; Amoroso, A.; An, Q.; An, Y.  h.; Bai, Y.; Bakina, O.; Bao, H. -R...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2634973
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