Speaker
Description
BESIII has collected 20.3 and 7.33 $fb^{-1}$ of e+e- collision data samples at 3.773 and 4.128-4.226 GeV, respectively, presenting a unique opportunity to test the non-perturbative nature of QCD in the charm sector. We will present the first experimental study of $D_{(s)}^{*+} \to l^+ \nu$ and the improved measurements of |Vcd|, |Vcs|, $D_s^+/D^+$ decay constant in $D_s^+/D^+ \to \mu^+ \nu$ and $\tau^+ \nu$.
Furthermore, we will summarize the most precise experimental results for $D_{(s)} \to K$, $D \to \pi$, $D_s \to \eta^{(‘)}$ transition form factors.
We will also discuss recent progresses in amplitude analyses and branching fraction measurements of $D_{(s)}\to h h l^+ \nu$ and $h h h l^+ \nu$ processes. On the hadron spectrum, scalar ($a_0, f_0, \sigma$), vector (K*, $\phi$), axial vector ($K_1, b_1$) particles are studied. The experimental results of $D \to a_0(980)$, $D \to \sigma$, $D \ K^*$, $D_s \to f_0(980)$, and $D_s \to \phi$ form factors will be presented.
