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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this paper, we present a detailed next-to-leading-order (NLO) study of$J/\psi$ angular distributions in $e^{+}e^{-} \to J/\psi+\eta_c,\chi_{cJ}$($J=0,1,2$) within the nonrelativistic QCD factorization (NRQCD). The numericalNLO expressions for total and differential cross sections, i.e.,$\frac{d\sigma}{d\cos\theta}=A+B\cos^2\theta$, are both derived. With theinclusion of the newly-calculated QCD corrections to $A$ and $B$, the$\alpha_{\theta}(= B/A)$ parameters in $J/\psi+\chi_{c0}$ and$J/\psi+\chi_{c1}$ are moderately enhanced, while the magnitude of${\alpha_\theta}_{J/\psi+\chi_{c2}}$ is significantly reduced; regarding theproduction of $J/\psi+\eta_c$, the $\alpha_\theta$ value remains unchanged. Bycomparing with experiment, we find the predicted${\alpha_\theta}_{J/\psi+\eta_c}$ is in good agreement with the$\textrm{B}\scriptsize{\textrm{ELLE}}$ measurement; however,${\alpha_\theta}_{J/\psi+\chi_{c0}}$ is still totally incompatible with theexperimental result, and this discrepancy seems to hardly be cured by properchoices of the charm-quark mass, the renormalization scale, and the NRQCDmatrix elements.

Next-to-leading-order study of $J/\psi$ angular distributions in $e^{+}e^{-} \to J/\psi+\eta_c,\chi_{cJ}$ at $\sqrt{s} \approx 10.6$ GeV