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

A study of the dynamics of the rare decay $K^\pm\to\pi^\pm\gamma\gamma$ hasbeen performed on a sample of 232 decay candidates, with an estimatedbackground of $17.4\pm1.1$ events, collected by the NA62 experiment at CERN in2007. The results are combined with those from a measurement conducted by theNA48/2 collaboration at CERN. The combined model-independent branching ratio inthe kinematic range $z=(m_{\gamma\gamma}/m_K)^2>0.2$ is ${\cal B}_{\rmMI}(z>0.2) = (0.965 \pm 0.063) \times 10^{-6}$, and the combined branchingratio in the full kinematic range assuming a Chiral Perturbation Theorydescription is ${\cal B}(K_{\pi\gamma\gamma}) = (1.003 \pm 0.056) \times10^{-6}$. A detailed comparison of the results with the previous measurementsis performed.

Study of the $K^\pm\to\pi^\pm\gamma\gamma$ decay by the NA62 experiment