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/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

We propose to test $P$- and $CP$-symmetries with the process $e^+e^- \toJ/\psi \to \Lambda\bar \Lambda$. The general form of the angular distributionof the process is derived and several observables for the proposed test areintroduced. With these observables one can distinguish the effects of$P$-violations in the production of $J/\psi$ from its decay into a pair of$\Lambda \bar \Lambda$. Numerical estimations for proposed asymmetries of$P$-violation due to $Z$ exchange in SM are given. Our results show that BESIIIhas reached the sensitivity to probe these effects. At the proposedsuper-tau-charm factory with much enhanced luminosity it will be able to testthe SM predictions with high precision. $CP$ violating effect in $J/\psi \to\Lambda \bar \Lambda$ can also be tested. In particular, BESIII data alreadyreached the sensitivity to prove $CP$ violating effect due to current upperlimit of electric dipole moment of $\Lambda$. At the proposed super-tau-charmfactory the upper limit can be improved by an order of magnitude.

Testing of $P$ and $CP$ Symmetries with $e^+e^- \to J/\psi \to \Lambda\bar \Lambda$