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

TL;DR

This study computes the strange baryon spectrum using $N_f=2+1+1$ twisted mass quarks, comparing mixed action and unitary setups to understand lattice artefacts and sea quark effects.

Contribution

It provides the first results on the octet and decuplet strange baryon spectrum with this specific quark setup and compares different lattice approaches.

Findings

Comparison of mixed action and unitary results reveals lattice artefacts.

Sea quark effects are analyzed by using two lattice spacings.

Results show consistency with previous $N_f=2$ calculations.

Abstract

We present first results on the octet and decuplet strange baryon spectrum with $N_f=2+1+1$ twisted mass quarks. We use an Osterwalder Seiler valence strange quark with a mass tuned to the kaon and compare the results with those obtained in the unitary setup. This comparison allows to perform a first study of the lattice artefacts introduced by the mixed action approach. We investigate the effect of the strange and charm quarks in the sea by using two lattice spacings and comparing with preceding $N_f = 2$ twisted mass fermion calculations.