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16–21 Aug 2019
Guilin Bravo Hotel, Guilin, China
Asia/Shanghai timezone

Triangle singularity in $J/\psi$ to $\eta \pi^0 \phi$

20 Aug 2019, 09:15
20m
Ludi Room (Guilin Bravo Hotel, Guilin, China)

Ludi Room

Guilin Bravo Hotel, Guilin, China

14 South Ronghu Road, Xiangshan, Guilin 541002, Guangxi, China
Parallel Session 5: Analysis tools Session 5: Analysis tools

Speaker

Mr Hao-Jie Jing (ITP,CAS)

Description

BESIII Collaboration has reported the observation of $a_0^0(980)-f_0(980)$ mixing. From the Dalitz plot of BESIII's paper for the decay $\eta \rightarrow \gamma \gamma$, one can see that there is a peak around $1.4$ GeV on $\pi^0 \phi$ distribution. In general, this peak can be interpreted as a dynamically resonance state or a kinematic effect. In this paper, by using the effective Lagrangian method to calculate a triangle diagram includes $K^*\bar{K}K$ loop for isospin breaking process $J/\psi \rightarrow \eta \pi^0 \phi$, we show that there is a peak appears in the Dalitz plot where the invariant mass of $\pi^0\phi$ around $1.4$ GeV by virtue of the triangle singularity. This may explain the peak around $1.4$ GeV of BESIII's experimental results. But whether the peak is the effect of triangle singularity or a resonance state requires further experimental results.

Primary author

Mr Hao-Jie Jing (ITP,CAS)

Presentation materials