Conveners
Hadron Spectroscopy: Hadron Spectroscopy
- Stuart Fegan (The George Washington University)
The $\Xi$ excited states are not well understood because of less experimental study. In this presentation, we report on the studies of $\Xi(1620)^0$ and $\Xi(1690)^0$ via the $\Xi_c^+ -> \Xi^- \pi^+ \pi^+$ decays by using a data sample collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We observe the $\Xi(1620)^0$ and measure its mass and width. We find an...
The BESIII experiment at the Beijing Electron Positron Collider (BEPCII) has collected the world's largest data sample at the $J/\psi$ resonance including 10 billion events, which offers an unique opportunity to study hadron spectroscopy and search for light exotic states. In 2003, BESII reported the first observation of a $p\bar{p}$ mass threshold enhancement $X(p\bar{p})$ in $J/\psi...
The discovery of XYZ particles is a big challenge for quark model. The model must be extended. By considering the high Fock components, an unquenched quark model is developed. The improved quark-pair creation operator in 3P0 model is invoked to deal with the mixing between quark-antiquark and meson-meson states. Gaussian expansion method is employed to do a high precision calculation of this...
The GlueX experiment is a photopoduction experiment located at Thomas Jefferson National Lab in Newport News, Virginia. GlueX is capable of making beam asymmetry ($\Sigma$) measurements using a tagged, linearly-polarized 9 GeV photon beam incident on a hydrogen target. Measurements of the beam asymmetry for the exclusive reactions, $\gamma p \rightarrow \eta p$ and $\gamma p \rightarrow \eta'...
