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The origin of ultra-high energy cosmic rays are still unknown, and this is one of the biggest problem in the area of ultra-high energy cosmic ray research field. One of the reasons is magnetic deflection, because most of the cosmic rays are charged particles and the universe is filled with galactic and extragalactic magnetic fields. On the other hand, there is no magnetic deflection to the photons, so that their trajectories can be traced back to their origins. Therefore, we search for ultra-high energy photons with the Telescope Array experiment in order to understand origin of ultra-high energy cosmic rays. The Telescope Array is a hybrid detector consisting of an array of scintillation detectors, which measure the lateral profile of air showers, and fluorescence detectors, which measure the longitudinal profile of air showers. We use a parameter called Xmax, which is the depth of maximal point of shower development, to search for photon-like events. We will report on the analysis method, and the result of a photon search using five years of TA data.

Search for UHE Photons with the Telescope Array Hybrid Detector