Searching for Exotic Particles at the Pierre Auger Observatory Using Bayesian Inference

Upper limits on the fractional composition of selected exotic particles in hybrid data from the Pierre Auger Observatory were obtained. Exotic particle types considered are magnetic monopoles, Q-balls, strangelets, micro-black holes and UHECRONs. A Bayesian method was used to set limits on the candidates at energies above 10$^{18}$ eV. By systematically comparing distributions of the parameter Xmax from simulated extensive air showers to a given set of data, this method obtains an upper limit on the composition fraction of the selected exotics. The method and results from the study will be discussed.