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

Inspired by the very recent LHCb measurements of $B_s \to J/\psi f_1(1285)$and the good agreement between the perturbative QCD predictions and the datafor many $B \to J/\psi V$ decays, we here investigate the $B_s \to J/\psif_1(1285)$ and $B_s \to J/\psi f_1(1420)$ decays for the first time byemploying the perturbative QCD (pQCD) approach, in which the $1^3P_1$ states$f_1(1285)$ and $f_1(1420)$ are believed to be the mixture of flavor singlet$f_1$ and octet $f_8$ or of quark-flavor states $f_{1q}$ and $f_{1s}$. We showthat the pQCD predictions for the branching ratio of $B_s \to J/\psi f_1(1285)$agree well with the data within errors for the mixing angle $\theta_{^3P_1}\approx 20^\circ (\phi_{^3P_1} \approx 15^\circ)$ between $f_1 (f_{1q})$ and$f_8 (f_{1s})$ states. Furthermore, the branching ratio of $B_s \to J/\psif_1(1420)$ and the large transverse polarization fractions in these twoconsidered channels are also predicted and will be tested by the LHC and theforthcoming Super-B factory experiments. Based on the decay rates of $B_s \toJ/\psi f_1(1285)$ and $B_s \to J/\psi f_1(1420)$ decay modes predicted in thepQCD approach, the extracted mixing angle between $f_1(1285)$ and $f_1(1420)$is basically consistent with currently available experimental measurements andlattice QCD analysis within still large theoretical errors.

Axial-vector $f_1(1285)-f_1(1420)$ mixing and $B_s \to J/\psi (f_1(1285), f_1(1420))$ decays