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 obtain the leading divergences at two-loop order for the decays $K_{S} \to\gamma \gamma$ and $K_{S} \to \gamma~\l^+ \l^-$ using only one-loop diagrams.We then find the double chiral logarithmic corrections to the decay branchingratio of $K_{S} \to \gamma \gamma$ and to the decay rate for $K_{S} \to\gamma~\l^+ \l^-$. It turns out that these effects are numerically small andtherefore make a very small enhancement on the branching ratio and decay rate.We also derive an expression for the corrections of type $\log \mu~\times$ LEC.Numerical analysis done for the process $K_{S} \to \gamma \gamma$ shows thatthese single logarithmic effects can be sizable but come with opposite signswith respect to the double chiral logarithms.

Leading Chiral Logarithms of $K_{S} \to \gamma \gamma$ and $K_{S} \to \gamma~l^+ l^-$ at two Loops