Title: Quantum gauge symmetry of reducible gauge theory,
Abstract: We derive the gaugeon formalism of the Kalb-Ramond field theory, a reducible
gauge theory, which discusses the quantum gauge freedom. In gaugeon formalism,
theory admits quantum gauge symmetry which leaves the action form-invariant.
The BRST symmetric gaugeon formalism is also studied which introduces the
gaugeon ghost fields and gaugeon ghosts of ghosts fields. To replace the
Yokoyama subsidiary conditions by a single Kugo-Ojima type condition the virtue
of BRST symmetry is utilized. Under generalized BRST transformations, we show
that the gaugeon fields appear naturally in the reducible gauge theory.