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

We present cross sections for the reaction $e^+e^-\to K_S^0K_L^0$ atcenter-of-mass energies ranging from 3.51 GeV to 4.95 GeV using data samplescollected in the BESIII experiment, corresponding to a total integratedluminosity of 26.5 fb$^{-1}$. The ratio of neutral-to-charged kaon form factorsat large momentum transfers ($12~{\rm GeV}^2<Q^2<25~{\rm GeV}^2$) is determinedto be $0.21\pm 0.01$, which indicates a small but significant effect offlavor-SU(3) breaking in the kaon wave function, and consequently excludes thepossibility that flavor-SU(3) breaking is the primary reason for the strongexperimental violation of the pQCD prediction$|F(\pi^{\pm})|/|F(K^{\pm})|=f^2_{\pi}/f^2_{K}$, where $F(\pi^{\pm})$ and$F(K^{\pm})$ are the form factors, and $f_{\pi}$ and $f_{K}$ are the decayconstants of charged pions and kaons, respectively. We also observe asignificant signal for the charmless decay $\psi(3770)\to K_S^0K_L^0$ for thefirst time. Within a $1\sigma$ contour of the likelihood value, the thebranching fraction for $\psi(3770)\to K_S^0K_L^0$ is determined to be ${\calB}=(2.63_{-1.59}^{+1.40})\times 10^{-5}$, and the relative phase between thecontinuum and $\psi(3770)$ amplitudes is $\phi=(-0.39_{-0.10}^{+0.05})\pi$. Thebranching fraction is in good agreement with the $\mathcal{S}$- and$\mathcal{D}$-wave charmonia mixing scheme proposed in the interpretation ofthe "$\rho\pi$ puzzle" between $J/\psi$ and $\psi(3686)$ decays.

Observation of significant flavor-SU(3) breaking in the kaon wave  function at $12~{\rm GeV}^2<Q^2<25~{\rm GeV}^2$ and discovery of the  charmless decay $\psi(3770)\to K_S^0K_L^0$