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

Recent BESIII data on radiative $J/\psi$ decays from $\sim 10^{10}$ $J/\psi$samples should significantly advance our understanding of the controversialnature of $\eta(1405/1475)$. This motivates us to develop a three-body unitarycoupled-channel model for radiative $J/\psi$ decays to three-meson final statesof any partial wave ($J^{PC}$). Basic building blocks of the model are bareresonance states such as $\eta(1405/1475)$ and $f_1(1420)$, and $\pi K$,$K\bar{K}$, and $\pi\eta$ two-body interactions that generate resonances suchas $K^*(892)$, $K^*_0(700)$, and $a_0(980)$. This model reasonably fits$K_SK_S\pi^0$ Dalitz plot pseudo data generated from the BESIII's$J^{PC}=0^{-+}$ amplitude for $J/\psi\to\gamma K_SK_S\pi^0$. The experimentalbranching ratios of $\eta(1405/1475)\to\eta\pi\pi$ and$\eta(1405/1475)\to\gamma\rho$ relative to that of $\eta(1405/1475)\toK\bar{K}\pi$ are simultaneously fitted. Our $0^{-+}$ amplitude is analyticallycontinued to find three poles, two of which correspond to $\eta(1405)$ ondifferent Riemann sheets of the $K^*\bar{K}$ channel, and the third one for$\eta(1475)$. This is the first pole determination of $\eta(1405/1475)$ and,furthermore, the first-ever pole determination from analyzing experimentalDalitz plot distributions with a manifestly three-body unitary coupled-channelframework. Process-dependent $\eta\pi\pi$, $\gamma\pi^+\pi^-$, and $\pi\pi\pi$lineshapes of $J/\psi\to\gamma(0^{-+})\to \gamma(\eta\pi\pi)$,$\gamma(\gamma\rho)$, and $\gamma(\pi\pi\pi)$ are predicted, and are inreasonable agreement with data. A triangle singularity is shown to play acrucial role to cause the large isospin violation of$J/\psi\to\gamma(\pi\pi\pi)$.

Three-body unitary coupled-channel approach to radiative $J/\psi$ decays and $\eta(1405/1475)$