We consider the superconformal index of class S theories of type D, which arise by compactification of the (2, 0) D n theories on a punctured Riemann surface C . We also allow for the presence of twist lines on C associated to the Z₂ outer automorphism of D n . For the two-parameter slice (p = 0, q, t) in the space of superconformal fugacities, we determine the 2d TQFT that computes the index.
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Lemos et al. (2014) studied this question.
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