2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/103508In the framework of the pure spinor approach of superstring theories, we describe the Y-formalism and use it to compute the picture raised b-field. At the end we discuss briefly the new, non-minimal formalism of Berkovits and the related non-minimal b-field.Talk given at the International Workshop "Supersymmetries and Quantum Symmetries" (SQS'05), Dubna, 27-31 July 2005High Energy Physics - Theorytext