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We describe the braiding statistics of topological twist defects in abelianbosonic bilayer (mmn) fractional quantum Hall (FQH) states, which reduce to theZ_n toric code when m=0. Twist defects carry non-abelian fractionalMajorana-like characteristics. We propose local statistical measurements thatdistinguish the fractional charge, or species, of a defect-quasiparticlecomposite. Degenerate ground states and basis transformations of a multi-defectsystem are characterized by a consistent set of fusion properties. Non-abelianunitary exchange operations are determined using half braids between defects,and projectively represent the sphere braid group in a closed system. Defectspin statistics are modified by equating exchange with 4\pi rotation. Thebraiding S matrix is identified with a Dehn twist (instead of a \pi/2 rotation)on a torus decorated with a non-trivial twofold branch cut, and represents thecongruent subgroup \Gamma_0(2) of modular transformations.

Braiding Statistics and Congruent Invariance of Twist Defects in Bosonic Bilayer Fractional Quantum Hall States