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

The $D^+_s\to K^+K^-\mu^+\nu_\mu$ decay is studied based on 7.33 fb$^{-1}$ of$e^+e^-$ collision data collected with the BESIII detector at center-of-massenergies in the range from 4.128 to 4.226 GeV. The absolute branching fractionis measured as ${\mathcal B}(D^+_s\to \phi \mu^+\nu_\mu) = (2.25\pm 0.09 \pm0.07) \times10^{-2}$, the most precise measurement to date. Combining with theworld average of ${\mathcal B}(D^+_s\to \phi e^+\nu_e)$, the ratio of thebranching fractions obtained is$\frac{{\mathcal B}(D^+_s\to \phi\mu^+\nu_\mu)}{{\mathcal B}(D^+_s\to \phi e^+\nu_e)} = 0.94\pm0.08$, inagreement with lepton universality. By performing a partial wave analysis, thehadronic form factor ratios at $q^{2}=0$ are extracted, finding$r_{V}=\frac{V(0)}{A_{1}(0)}=1.58\pm0.17\pm0.02$ and$r_{2}=\frac{A_{2}(0)}{A_{1}(0)}=0.71\pm0.14\pm0.02$, where the firstuncertainties are statistical and the second are systematic. No significant$S$-wave contribution from $f_0(980)\to K^+K^-$ is found. The upper limit$\mathcal{B}(D_s^+\to f_0(980)\mu^{+}{\nu}_{\mu}) \cdot{\mathcal B}(f_0(980)\toK^+K^-) < 5.45 \times 10^{-4}$ is set at 90\% confidence level.

Studies of the decay $D^+_s\to K^+K^- \mu^+ \nu_{\mu}$