Baryon spectrum using Nf=2+1+1 ensembles of twisted mass fermions

Understand

We present results on the masses of the low-lying baryons using ten ensembles of gauge configurations with $N_f =2+1+1$ dynamical twisted mass fermions, at three values of the lattice spacing, spanning a pion mass range from about 210 MeV to about 430 MeV.

• The strange and charm quark masses are tuned to approximately their physical values.
• We examine isospin symmetry breaking effects on the baryon mass and the dependence on the lattice spacing.
• After taking the continuum limit we use chiral perturbation theory to extrapolate to the physical vlaue of the pion mass for all forty baryons.