Speaker
Description
This talk will present four recent measurements conducted by BESIII, focusing on the cross-sections of electron-positron annihilation into open-charm and hidden-charm final states within the center-of-mass energies ranging from 3.80 to 4.95 GeV. The open charm final states include $e^+ e^- \to D \bar{D}$ and $D_s^+ D_s^-$, revealing abundant structures in their cross-section line shapes. The hidden-charm final states encompass $e^+ e^- \to \eta h_c$ and $\omega \chi_{c1/2}$, with an observed structure near 4.2 GeV in the former channel and two structures in the latter. While one of these structures can be linked to the previously discovered $\psi$(4415), the others represent novel observations. These new cross-section measurements at the $\tau$-charm energy region provide crucial insights into the spectrum of vector charmonium and charmonium-like states.
| Alternate track | 05. Quark and Lepton Flavour Physics |
|---|---|
| I read the instructions above | Yes |
