1111.4857 (S. Dinter et al.)

Nucleon scalar matrix elements with $N_f=2+1+1$ twisted mass fermions    [PDF]

S. Dinter, V. Drach, K. Jansen

We investigate scalar matrix elements of the nucleon using $N_f=2+1+1$
flavors of maximally twisted mass fermions at a fixed value of the lattice
spacing of $a\approx 0.078{\rm fm}$. We compute disconnected contributions to
the relevant three-point functions using an efficient noise reduction
technique. Using these methods together with an only multiplicative
renormalization applicable for twisted mass fermions, allows us to obtain
accurate results in the light and strange sector.

View original: http://arxiv.org/abs/1111.4857