Partially quenched study of strange baryon with Nf = 2 twisted mass fermions

We present results on the mass of the baryon octet and decuplet using two flavors of light dynamical twisted mass fermions. The strange quark mass is fixed to its physical value from the kaon sector in a partially quenched set up. Calculations are perf ormed for light quark masses corresponding to a pion mass in the range 270-500 MeV and lattice sizes of 2.1 fm and 2.7 fm. We check for cut-off effects and isospin breaking by evaluatin g the baryon masses at two different lattice spacings. We carry out a chiral extrapolation for th e octet baryons and discuss results for the Ω.