Search for ultra-high energy photons and neutrinos using Telescope Array surface detector

摘要

We search for ultra-high energy photons by analyzing geometrical properties of shower fronts of events registered by the Telescope Array surface detector.By making use of an event-by-event statistical method, we derive upper limits on the absolute flux of primary photons with energies above 10~(19) eV, 10~(19.5) eV and above 10~(20)eV based on the three years data from Telescope Array surface detector (May 2008 - May 2011).We report the results of down-going neutrino search based on the analysis of very inclined events.