AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Citation
PHYSICAL REVIEW D, Vol.88, No.11 [2013], p1-7
Abstract
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), 10(19.5), and 10(20) eV based on the first three years of data taken.