MENU 2016

D¯Σc∗ and D¯∗Σc interactions and the LHCb hidden-charmed pentaquarks

27 Jul 2016, 14:15

30m

2F Room III (Clock Tower Centennial Hall, Kyoto University)

Board: 27-PQ-2-1

Pentaquarks

Speaker

Jun He (Institute of Modern Physics, Chinese Academy of Sciences)

Description

Recently, two hidden-charmed resonances $P_c(4380)$ and $P_c(4450)$ consistent with pentaquark states were observed at the LHCb detector. The two $P_c$ states locate just below the $\overline{D}{\mathrm{\Sigma }}_c^{\ast }$ and ${\overline{D}}^{\ast }{\mathrm{\Sigma }}_c$ thresholds with mass of gaps about 5 and 15 MeV, respectively. Inspired by this fact we perform a dynamical investigation about the $\overline{D}{\mathrm{\Sigma }}_c^{\ast }(2520)$ and ${\overline{D}}^{\ast }{\mathrm{\Sigma }}_c(2455)$ interactions which are described by the meson exchanges. A bound state which carries spin-parity $J^P=3/2^{-}$ is produced from the $\overline{D}{\mathrm{\Sigma }}_c^{\ast }(2520)$ interaction, which is consistent with the $P_c(4380)$ observed at the LHCb detector. From the $D^{\ast }{\mathrm{\Sigma }}_c(2455)$ interaction, a bound state with $5/2^{+}$ is produced, which can be related to the $P_c(4450)$. The results suggest that the $P_c(4380)$ and $P_c(4450)$ are good candidates of $\overline{D}{\mathrm{\Sigma }}_c^{\ast }(2520)$ and ${\overline{D}}^{\ast }{\mathrm{\Sigma }}_c(2455)$ molecular states, respectively.

Presentation materials

Slides

qBSE.pdf