Abstract: The talk will focus on two problems: Black holes formation by particle collisions in quantum physics.The approach which will be presented is based on constructing a horizon wave-function which yields the probability of finding a black hole horizon of a certain radius centered around the source. The case study of two highly boosted non-interacting particles that collide in a one-dimensional space will be considered. The second part will focus on possible searches for non-thermal quantum black hole decay signatures in the data recorded by cosmic ray experiments or neutrino observatories. As the black hole masses are close to the Planck scale, they would typically decay into two particles emitted back-to-back which produce unique shower signatures.