Study of Dispersion of Mass Distribution of Ultra-High Energy Cosmic Rays using a Surface Array of Muon and Electromagnetic Detectors

摘要

We consider a hypothetical observatory of ultra-high energy cosmic raysconsisting of two surface detector arrays that measure independentlyelectromagnetic and muon signals induced by air showers. Using the constantintensity cut method, sets of events ordered according to each of both signalsizes are compared giving the number of matched events. Based on its dependenceon the zenith angle, a parameter sensitive to the dispersion of thedistribution of the logarithmic mass of cosmic rays is introduced. The resultsobtained using two post-LHC models of hadronic interactions are very similarand indicate a weak dependence on details of these interactions.