Applied Physics and Mathematics Annotation << Back PHOTON AS A GAUGE BOSON AND ITS LINEAR POLARIZATION I.P. POPOV The defect of the angular momentum of an electron under cyclotron (synchrotron) radiation, including in terms of its spatial orientation, as well as the spatial orientation of the emitted photon, is considered. The possibility of compatibility of the idea of a photon as a gauge boson, which can exist only in two spin states – ±1, and a linearly polarized photon, i.e. having no back. It is established that the photon has no spin. The angular momentum defect can carry away a spinless photon. As applied to the angular momentum defect, the momentum arm of a photon is equal to its reduced wavelength. Keywords: photon, spin, cyclotron motion, radiation, angular momentum defect, polarization. DOI: 10.25791/pfim.01.2023.1248 Pp. 12-16.