中国物理学会高能物理分会第十二届全国会员代表大会暨学术年会

Observation of the $X(2370)$ in $J/\psi\rightarrow\gamma K^{0}_{S}K^{0}_{S}\pi^{0}$ and $J/\psi\rightarrow\gamma \pi^{0}\pi^{0}\eta$

Not scheduled

15m

汕头厅 (2号楼二楼)

海报 分会2：强子物理与味物理

Speaker

硕 石 (高能物理研究所)

Description

Based on $(10087\pm44)\times10^{6}$ $J/\psi$ events collected with the BESIII detector,
the $J/\psi\rightarrow\gamma K^{0}_{S}K^{0}_{S}\pi^{0}$ and $J/\psi\rightarrow\gamma \pi^{0}\pi^{0}\eta$ processes are studied.
The $X(2370)$ is observed in both the $K^{0}_{S}K^{0}_{S}\pi^{0}$ and $\pi^{0}\pi^{0}\eta$ invariant mass spectra,
with statistical significances greater than $14\sigma$ and $20\sigma$, respectively.
Combining measurements from these processes with measurements from the previously reported $J/\psi\rightarrow\gamma K^{0}_{S}K^{0}_{S}\eta^{\prime}$ process,
the mass and width of the $X(2370)$ are determined to be
$2359^{+13}_{-14}~\mathrm{MeV}/c^{2}$ and $170^{+44}_{-29}~\mathrm{MeV}$, respectively.
In addition, the decay $X(2370)\to a_{0}(980)^{0}\pi^{0}$ with $a_{0}(980)^{0}\to \pi^{0}\eta$
is observed with a statistical significance exceeding $9\sigma$.
The similarities in decay modes between the $X(2370)$ and $\eta_{c}$ are consistent with the features of a pseudoscalar glueball.