CLAS physics database search results Measurement E151M1175 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.55 186 -0.4031 0.8992 0.042 0.55 210 1.4613 1.0728 0.1109 0.65 138 -0.1658 0.8988 0.0324 0.65 186 0.0385 1.0106 0.0301 0.65 198 -0.6271 0.7349 0.0548 0.65 210 0.2229 0.8776 0.0341 0.75 102 0.2276 0.8084 0.0343 0.75 114 -0.7889 0.7757 0.065 0.75 126 2.4618 1.1492 0.1824 0.75 198 -0.783 0.7886 0.0646 0.75 210 0.7321 0.8041 0.0613 0.75 222 -0.5198 0.7425 0.0484 0.75 270 -0.1025 0.8681 0.0309 0.75 282 0.2204 0.8102 0.0341 0.85 90 -0.3526 0.7049 0.0396 0.85 102 0.0331 0.6859 0.0301 0.85 114 0.1272 0.6812 0.0314 0.85 126 -0.8685 0.7816 0.0702 0.85 174 0.264 0.925 0.0357 0.85 186 0.2748 0.7888 0.0361 0.85 198 0.3688 0.6597 0.0403 0.85 210 0.7382 0.7966 0.0617 0.85 222 0.4923 0.7224 0.0468 0.85 234 -0.8643 0.613 0.0699 0.95 186 -0.3259 0.7377 0.0383 0.95 198 0.2965 0.8061 0.037 0.95 210 -0.8949 0.6206 0.072 0.95 234 -1.303 0.6239 0.0999