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

By analyzing an $e^+e^-$ annihilation data sample corresponding to anintegrated luminosity of $2.93~\mathrm{fb}^{-1}$ collected at a center-of-massenergy of 3.773 GeV with the BESIII detector, we measure the branching fractionof the $D^0\to \rho^- \mu^+\nu_\mu$ decay for the first time. We obtain${\mathcal B}_{D^0\to \rho^- \mu^+\nu_\mu}=(1.35\pm0.09_{\rm stat}\pm0.09_{\rmsyst})\times 10^{-3}$. Using the world average of ${\mathcal B}_{D^0\to \rho^-e^+\nu_e}$, we find a branching fraction ratio of ${\mathcal B}_{D^0\to \rho^-\mu^+\nu_\mu}/{\mathcal B}_{D^0\to \rho^- e^+\nu_e}=0.90\pm0.11$, which agreeswith the theoretical expectation of lepton flavor universality within theuncertainty. Combining the world average of ${\mathcal B}_{D^+\to \rho^0 \mu^+\nu_\mu}$ and the lifetimes of $D^{0(+)}$, we obtain a partial decay widthratio of ${\Gamma}_{D^0\to \rho^- \mu^+ \nu_{\mu}}/(2{\Gamma}_{D^+\to \rho^0\mu^+ \nu_{\mu}}) = 0.71\pm0.14$, which is consistent with the isospin symmetryexpectation of one within $2.1\sigma$. For the reported values of ${\mathcalB}_{D^0\to \rho^- \mu^+\nu_\mu}/{\mathcal B}_{D^0\to \rho^- e^+\nu_e}$ and${\Gamma}_{D^0\to \rho^- \mu^+ \nu_{\mu}}/2{\Gamma}_{D^+\to \rho^0 \mu^+\nu_{\mu}}$, the uncertainty is the quadratic sum of the statistical andsystematic uncertainties.

Observation of the Decay $D^0\to \rho^-\mu^+\nu_\mu$