Conveners
Session 1
- Beijiang LIU (高能所)
It is shown that all predictions for the light scalars, based on their four-quark nature, are supported by experiment. The future research program is outlined also.
In this talk, recent measurements of the cross-section of $e^+ e^- \to \pi^+ \pi^- J/\psi$, $e^+ e^- \to K^+ K^- J/\psi$, and $e^+ e^- \to \pi^+ \pi^- \psi_2(3823)$ at BESIII will be reported. It will include the new decay modes of the well-known resonance, such as $Y(4230)$, and the new observed structures that strongly coupled to these channels.
The CMD-3 experiment at the VEPP-2000 collider is aimed to measure the cross-sections and dynamics of the exclusive modes of $e^+ e^- \to hadrons$ reactions in the system energy range from 0.32 GeV to 2 GeV.
The experiment has collected $600~pb^{-1}$. In this report we will discuss current status and results obtained by the collaboration of the CMD-3 experiment.
A special scan for data collection at the $p\bar{p}$ and $n\bar{n}$ thresholds has been performed at the VEPP2000 $e^+e^-$ collider. About 10 $pb^{-1}$ per point were collected by the SND and CMD-3 detectors with about 1 MeV step, comparable with the energy spread of the c.m. energy. Energy stability at the level 0.1 MeV was continuously monitored by the back-scattering laser system. We...
As an iso-spin partner of the charged $Z_{cs}(3985)$ state, the evidence for a neutral near-threshold structure in the $K_s$ recoil-mass spectra in $e^+ e^- \to K_s (D_s^- D^{*+} + D_s^{*-} D^+)$ will be reported. Also, there will be report of searching for $X(3872) \to \pi^0 \chi_{c0}$ and $X(3872) \to \pi \pi \chi_{c0}$ at BESIII. For the $Y$ state, the cross-section measurements of the $e^+...
