CALDER: Cryogenic light detectors for rare events search

The CALDER project aims at developing cryogenic light detectors with high sensitivity to UV and visible light, to be used for particle tagging in massive bolometers. Indeed the sensitivity of CUORE can be increased by a factor of 3, thanks to the reduction of the ?-background, obtained by detecting the Cherenkov light (100 eV) emitted by ?/? events. Currently used light detectors have not the features required to address this task, so we decided to develop a new light detector using Kinetic Inductance Detector as a sensor. This approach is very challenging and requires an intensive R&D to be satisfied. The first results of this activity are shown in the following.