Z Extremization in Chiral-Like Chern Simons

Abstract: We study the localized free energy on S3 of three-dimensional N = 2 Chern-Simons matter theories at weak coupling. We compute the two loop R charge in three different ways, namely by the standard perturbative approach, by extremiz-ing the localized partition function at finite N and by applying the standard saddle point approximation for large N. We show that the latter approach does not repro-duce the expected result when chiral theories are considered. We circumvent these problems by restoring a reflection symmetry on the eigenvalues in the free energy. Thanks to this symmetrization we find that the three methods employed agree. In particular we match the computation for a model whose four dimensional parent is the quiver gauge theory describing D3 branes probing the Hirzebruch surface. We conclude by commenting on the application of our results and to the strong coupling regime.ar X i