Abouzaid E. et al.YEE HSIUNG2018-09-102018-09-102006-04http://inspirehep.net/record/714506http://scholars.lib.ntu.edu.tw/handle/123456789/323316Measurement of direct photon emission in the $K_{L} \\to \\pi^{+} \\pi^{-} \\gamma$ decay modejournal article10.1103/PhysRevD.74.032004