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 Tools annual

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 Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We describe the computation of the amplitude A_2 for a kaon to decay into twopions with isospin I=2. The results presented in the letter Phys.Rev.Lett. 108(2012) 141601 from an analysis of 63 gluon configurations are updated to 146configurations giving Re$A_2=1.381(46)_{\textrm{stat}}(258)_{\textrm{syst}}10^{-8}$ GeV and Im$A_2=-6.54(46)_{\textrm{stat}}(120)_{\textrm{syst}}10^{-13}$GeV. Re$A_2$ is in good agreement with the experimental result, whereas thevalue of Im$A_2$ was hitherto unknown. We are also working towards a directcomputation of the $K\to(\pi\pi)_{I=0}$ amplitude $A_0$ but, within thestandard model, our result for Im$A_2$ can be combined with the experimentalresults for Re$A_0$, Re$A_2$ and $\epsilon^\prime/\epsilon$ to giveIm$A_0/$Re$A_0= -1.61(28)\times 10^{-4}$ . Our result for Im\,$A_2$ impliesthat the electroweak penguin (EWP) contribution to $\epsilon^\prime/\epsilon$is Re$(\epsilon^\prime/\epsilon)_{\mathrm{EWP}} = -(6.25 \pm0.44_{\textrm{stat}} \pm 1.19_{\textrm{syst}}) \times 10^{-4}$.

Lattice determination of the $K \to (\pi\pi)_{I=2}$ Decay Amplitude $A_2$