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

Using 2.93~fb$^{-1}$ of data taken at 3.773 GeV with the BESIII detectoroperated at the BEPCII collider, we study the semileptonic decays $D^+ \to \barK^0e^+\nu_e$ and $D^+ \to \pi^0 e^+\nu_e$. We measure the absolute decaybranching fractions $\mathcal B(D^+ \to \bar K^0e^+\nu_e)=(8.60\pm0.06\pm0.15)\times10^{-2}$ and $\mathcal B(D^+ \to\pi^0e^+\nu_e)=(3.63\pm0.08\pm0.05)\times10^{-3}$, where the firstuncertainties are statistical and the second systematic. We also measure thedifferential decay rates and study the form factors of these two decays. Withthe values of $|V_{cs}|$ and $|V_{cd}|$ from Particle Data Group fits assumingCKM unitarity, we obtain the values of the form factors at $q^2=0$, $f^K_+(0) =0.725\pm0.004\pm 0.012$ and $f^{\pi}_+(0) = 0.622\pm0.012\pm 0.003$. Takinginput from recent lattice QCD calculations of these form factors, we determinevalues of the CKM matrix elements $|V_{cs}|=0.944 \pm 0.005 \pm 0.015 \pm0.024$ and $|V_{cd}|=0.210 \pm 0.004 \pm 0.001 \pm 0.009$, where the thirduncertainties are theoretical.

Analysis of $D^+\to\bar K^0e^+\nu_e$ and $D^+\to\pi^0e^+\nu_e$ Semileptonic Decays