  Recently the CIBER experiment measured the diffuse cosmic infrared background
(CIB) flux and claimed an excess compared with integrated emission from
galaxies. We show that the CIB spectrum can be fitted by the additional photons
produced by the decay of a new particle. However, it also contributes too much
to the anisotropy of the CIB, which is in contradiction with the anisotropy
measurements by the CIBER and Hubble Space Telescope.
