The hadronic decays of charmed mesons at BESIII

TL;DR

The paper presents amplitude analyses and branching-fraction measurements for multiple hadronic decays of charmed mesons studied with BESIII near charm-threshold, revealing rich resonance structures and challenging existing theoretical expectations. By decomposing decay amplitudes into topologies such as $T$, $C$, $E$, and $A$ and exploiting double-tag techniques, the work provides precise insights into non-perturbative QCD, scalar and vector meson dynamics (including $a_0(980)$, $f_0(980)$, and $\phi$ decays), and polarization phenomena in $D \to VV$ decays. Key findings include a strong enhancement of $D^0 \to a_0(980)^+ \pi^-$ over $D^0 \to a_0(980)^-\pi^+$, the first observation of pure $W$-annihilation in $D_s^+ \to \omega \rho^+$, and a precise measurement of $R_{\phi \to K\bar{K}}$ that disagrees with PDG values, all of which have significant implications for hadron spectroscopy and CP-violation studies. Together, these results establish stringent experimental inputs for non-perturbative QCD and set the stage for future discoveries with larger BESIII data samples.

Abstract

In this presentation, we discuss the recent hadronic decays of charmed mesons observed in the BESIII experiment, specifically focusing on the decay processes $D^+ \to K_S^0 π^+ η$, $D^0 \to π^+ π^- η$, $D^+ \to π^+ π^0 η$, $D_s^+ \to π^+ π^+ π^- π^0$, $D_s^+ \to π^+ π^+ π^- π^0 π^0$, $D_s^+ \to K_S^0 K_L^0 π^+$, and $D^+ \to K_S^0 K_S^0 π^+$. We present results from amplitude analyses revealing rich structures in these decay processes. Furthermore, we report on the $φ$ decay ratio in $D_s^{\pm}$ decays. Our findings have significant implications for fundamental inputs related to non-perturbative QCD, hadronic matter structure, and studies of $\mathit{CP}$ violation.