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

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.

Comments: 6 pages, Proceedings of the 36th Annual International Symposium on Lattice Field Theory - LATTICE2018