# Charmonium-nucleon interactions from 2+1 flavor lattice QCD

## TL;DR

This study uses advanced lattice QCD techniques to analyze charmonium-nucleon interactions, revealing significant hyperfine splitting but no bound states, thus improving understanding of these interactions with reduced systematic errors.

## Contribution

It introduces a larger lattice volume and relativistic heavy quark action to reduce systematic errors in charmonium-nucleon interaction studies.

## Key findings

- Significant J/ψN hyperfine splitting observed
- No bound states found below thresholds
- Enhanced accuracy over previous studies

## Abstract

The charmonium-nucleon interaction is studied by the time-dependent HAL QCD method. We use a larger lattice volume and the relativistic heavy quark action for charm quark to obtain less systematic errors than those in our previous study. As a result, the sizable J/$\psi$N hyperfine splitting is observed, indicating that the spin-spin interaction is important to understand this system quantitatively. No J/$\psi$N or $\eta_c$N bound state is observed below the thresholds as in the previous results.