2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52210It is a well known result that the scalar field spectrum is composed of two chiral particles (Floreanini-Jackiw particles) of opposite chiralities. Also, that a Siegel particle spectrum is formed by a nonmover field (a Hull's noton) and a FJ particle. We show here that, in fact, the spectrum of the chiral boson on a circle has a particle not present in its currently well known spectrum.11 pages, Latex. Final version to appear in Braz. J. PhysHigh Energy Physics - Theorytext