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 report a study of $B\to (J/\psi \gamma) K$ and $B\to (\psi' \gamma)K$decay modes using $772\times 10^{6}$ $B\bar{B}$ events collected at the\Upsilon(4S)$ resonance with the Belle detector at the KEKB energy-asymmetric$e^+ e^-$ collider. We observe $X(3872) \to J/\psi \gamma$ and report the firstevidence for $\chi_{c2} \to J/\psi \gamma$ in $B\to (X_{c\bar{c}}\gamma) K$decays, while in a search for $X(3872) \to \psi' \gamma$ no significant signalis found. We measure the branching fractions, $\mathcal{B}(B^{\pm} \to X(3872)K^{\pm}) \mathcal{B}(X(3872) \to J/\psi\gamma)$ $=$ $(1.78^{+0.48}_{-0.44}\pm0.12)\times 10^{-6}$, $\mathcal{B} (B^{\pm} \to\chi_{c2} K^{\pm})$$=$$(1.11^{+0.36}_{-0.34} \pm 0.09) \times 10^{-5}$, $\mathcal{B}(B^{\pm} \toX(3872) K^{\pm}) \mathcal{B}(X(3872) \to \psi'\gamma)$ $<$ $3.45\times 10^{-6}$(upper limit at 90% C.L.) and also provide upper limits for other searches.

Observation of $X(3872)\to J/\psi \gamma$ and search for $X(3872)\to\psi'\gamma$ in B decays