English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Using $(10087\pm44)\times 10^{6}$ $J/\psi$ events collected with the BESIIIdetector, numerous $\Xi^-$ and $\Lambda$ decay asymmetry parameters aresimultaneously determined from the process $J/\psi \to \Xi^- \bar{\Xi}^+ \to\Lambda(p\pi^-) \pi^- \bar{\Lambda}(\bar{n} \pi^0) \pi^+$ and itscharge-conjugate channel. The precisions of $\alpha_0$ for $\Lambda \to n\pi^0$and $\bar{\alpha}_0$ for $\bar{\Lambda} \to \bar{n}\pi^0$ compared to worldaverages are improved by factors of 4 and 1.7, respectively. The ratio of decayasymmetry parameters of $\Lambda \to n\pi^0$ to that of $\Lambda \to p\pi^-$,$\langle \alpha_0 \rangle/ \langle \alpha_{\Lambda -} \rangle $, is determinedto be $ 0.873 \pm 0.012^{+0.011}_{-0.010}$, where the first and the seconduncertainties are statistical and systematic, respectively. The ratio issmaller than unity more than $5\sigma$, which signifies the existence of the$\Delta I = 3/2$ transition in $\Lambda$ for the first time. Beside, we testfor CP violation in $\Xi^- \to \Lambda \pi^-$ and in $\Lambda \to n \pi^{0}$with the best precision to date.

Investigation of the $\Delta I = 1/2$ rule and test of CP violation through the measurement of decay asymmetry parameters in $\Xi^-$ decays