Sensitivity of XENON detectors to Galactic/Solar Axions and Bosonic Super-WIMPs based on the Axio-electric Effect

We investigate the sensitivity of the XENON detectors to hypothetical Galactic/Solar axions and Bosonic Super-WIMPs using axio-electric effect (analogue of the photoelectric effect) on xenon atoms. Since liquid xenon detectors also provide an extremely low radioactivity environment for electron recoils, very weakly-interacting low-mass particles (\textless 100 keV/c$^{2})$, such as the hypothetical axion (and Bosonic Super-WIMP), could be detected using the axio-electric effect. The limits for the axion-electron coupling constant g$_{Ae}$ were calculated from the analysis of 224.6 live days X 40 kg of exposure of XENON100 Dark Matter Detector. For the future ton-scale liquid Xe detectors (e.g. XENON1T) assuming one ton-year of exposure, galactic axions (as non-relativistic dark matter) could be detected if the axio-electric coupling g$_{Ae}$ is greater than 10$^{-14}$ at 1 keV/c$^{2}$ (or 10$^{-13}$ at 100 keV/c$^{2})$. Below a few keV/c$^{2}$, and independent of the mass, a solar axion search would be sensitive to a coupling g$_{Ae}$ $\sim$10$^{-12}$.