Abstract
We show that there exist enlarged stringy (α′→∞) symmetries for (evenG-parity) massive modes in the 10D fermionic string theory. These symmetries are derived from on-shell Ward identities corresponding to the decoupling of massive gauge states in the spectrum. In the generalized massive supersymmetric σ-model formalism, some symmetry transformations relate particles with different spins in the first order weak field approximation.
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Lee, JC. Massive inter-particle symmetry and Ward identity in fermionic string theory. Z. Phys. C - Particles and Fields 65, 151–154 (1995). https://doi.org/10.1007/BF01571315
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DOI: https://doi.org/10.1007/BF01571315