Searches for Large Extra Dimensions in the DANSS Experiment

The DANSS detector is placed under the reactor core of Kalinin NPP (at distances 10.9–12.9 m) and collects up to 5000 antineutrino events daily. One of the main goals of the experiment is to scrutinize the sterile neutrino hypothesis. A large fraction of allowed parameter space was excluded by DANSS: for some values of \(\Delta m^{2}\), the exclusion goes down to \(\sin^{2}(2\theta)<0.01\), which had become the best in the world. In addition, the combination of a favorable detector placement near the reactor and large acquired statistics allows us to investigate other scenarios of electron antineutrino disappearance. This paper reports preliminary results on probing the Large Extra Dimensions (LED) hypothesis in the simplest approach of only one additional dimension. This theory describes particle oscillations to hidden, finite-size dimensions and provides sensitivity to neutrino masses. The report covers MC generation for different LED parameters, the study of the experiment sensitivity for oscillation to LED, and the investigation of exclusion areas in the parameter space in the coordinates of \(a\) and \(m_{0}\)—the size of a hidden large extra dimension and a mass of the lightest neutrino.