# Investigating volume effects for N$_f$=2 twisted clover fermions at the physical point

## TL;DR

This paper presents preliminary lattice QCD results for nucleon structure observables using twisted clover fermions at the physical point, comparing different volumes and quark flavor setups to assess systematic effects.

## Contribution

It provides new lattice QCD calculations of nucleon charges and moments at the physical point with volume and quenching effect analysis.

## Key findings

- Results are consistent across different volumes and quark setups.
- Volume effects are quantified by comparing different lattice sizes.
- Quenching effects are addressed through comparison with previous ensembles.

## Abstract

In this work we present preliminary results on the nucleon axial and tensor charges, the quark momentum fraction and the first moment of the helicity distribution. The simulations have been performed using two $N_f{=}2$ and $N_f{=}2{+}1{+}1$ ensembles. Both ensembles have a twisted mass action with a clover term with the quark masses fixed at their physical values (physical point) and volumes of $64^3{\times}128$. The extracted quantities are compared with results from an existing $N_f{=}2$ ($48^3{\times}96$) ensemble. This comparison allows one to address volume and quenching effects.