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We present first results on the octet and decuplet strange baryon spectrumwith $N_f=2+1+1$ twisted mass quarks. We use an Osterwalder Seiler valencestrange quark with a mass tuned to the kaon and compare the results with thoseobtained in the unitary setup. This comparison allows to perform a first studyof the lattice artefacts introduced by the mixed action approach. Weinvestigate the effect of the strange and charm quarks in the sea by using twolattice spacings and comparing with preceding $N_f = 2$ twisted mass fermioncalculations.

Low lying baryon spectrum with $N_f = 2+1+1$ dynamical twisted quarks