CLAS physics database search results Measurement E151M990 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.65 258 0.3467 0.8393 0.0393 0.65 270 -0.6393 0.6182 0.0555 0.75 90 0.0009 0.6389 0.03 0.75 102 -0.9225 0.6268 0.0738 0.75 114 1.4496 0.7485 0.1101 0.75 246 1.1486 0.6835 0.0892 0.75 258 -1.7378 0.3486 0.1305 0.75 270 -0.538 0.6316 0.0495 0.75 282 1.7128 0.8167 0.1287 0.85 90 0.6791 0.8567 0.058 0.85 102 0.3158 0.6199 0.0379 0.85 114 -0.3656 0.637 0.0402 0.85 126 2.1016 0.6119 0.1565 0.85 138 0.3393 0.7404 0.0389 0.85 222 -0.7051 0.5722 0.0596 0.85 234 -0.6994 0.5833 0.0593 0.85 246 -0.0139 0.5964 0.03 0.85 258 -0.1283 0.5307 0.0314 0.85 270 -0.385 0.5893 0.0411 0.85 282 0.753 0.6402 0.0627 0.95 102 0.2015 0.8456 0.0334 0.95 114 -0.2268 0.6367 0.0343 0.95 258 -0.2464 0.6183 0.035 0.95 270 0.5977 0.6219 0.053 0.95 282 -0.6551 0.5349 0.0565 0.95 294 0.2254 0.6903 0.0342