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# 中国物理学会高能物理分会第十一届全国会员代表大会暨学术年会

Aug 8 – 12, 2022
Asia/Shanghai timezone

## Lattice calculation of the $\eta_c\eta_c$ and $J/\psi J/\psi$ scattering length

Aug 9, 2022, 3:45 PM
15m
Oral report 强子物理与味物理

### Speaker

Dr Yu Meng (Zhengzhou University)

### Description

We calculate the s-wave scattering length in the $0^+$ sector of $\eta_c\eta_c$ and the $2^+$ sector of $J/\psi J/\psi$ using three $N_f=2$ twisted mass gauge ensembles
with the lattice spacing $a=0.0667,0.085,0.098$ fm, respectively.
The scattering lengths are extracted using the conventional L{\"u}scher finite size method. We observe significant discretization effects and therefore perform a continuum extrapolation. Finally, we obtain the results as $a^{0^+}_{\eta_c\eta_c}=-0.104(09)$ fm and $a^{2^+}_{J/\psi J/\psi}=-0.165(16)$ fm, where the errors are statistical errors with the uncertainties of lattice spacing taken into account. Both scattering lengths are negative, indicating that the interaction between the two charmonia are repulsive in nature in both channels being studied.

### Primary author

Dr Yu Meng (Zhengzhou University)