2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/227118We construct a class of analytic solutions of WZW-type open superstring field theory describing marginal deformations of a reference D-brane background. The deformations we consider are generated by on-shell vertex operators with vanishing operator products. The superstring solution exhibits an intriguing duality with the corresponding marginal solution of the {\it bosonic} string. In particular, the superstring problem is ``dual'' to the problem of re-expressing the bosonic marginal solution in pure gauge form. This represents the first nonsingular analytic solution of open superstring field theory.19 pages; References added; Discussion of a new solution satisfying the reality condition is added in an appendixHigh Energy Physics - Theorytext