Abstract

We modify Witten's action for the NSR superstring. Our proposal is based on the use of new “double-step” picture-changing operators. The modified action, in contrast to Witten's, generates N-point tree-level amplitudes which agree with the Koba-Nielsen amplitudes. The action is gauge invariant without any reference to a regularization and manifestly space-time supersymmetric. The algebra of the gauge transformations is closed and the classical equations of motion do not contain any picture-changing insertions.

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