CLAS physics database search results Measurement E151M574 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.25 66 0.6405 0.7994 0.0493 0.35 294 -1.1467 0.5591 0.0763 0.65 102 1.7585 0.7215 0.1117 0.65 258 -1.4357 0.4142 0.0928 0.75 90 -0.5976 0.6135 0.0473 0.75 102 -0.2124 0.5943 0.0327 0.75 114 0.0604 0.7662 0.0302 0.75 246 0.5555 0.6951 0.0453 0.75 258 0.7322 0.7243 0.0539 0.75 270 0.0131 0.6324 0.03 0.75 282 0.0011 0.7868 0.03 0.85 90 -0.5897 0.6277 0.0469 0.85 102 0.2241 0.658 0.033 0.85 114 -0.748 0.5151 0.0547 0.85 234 1.3817 0.7581 0.0897 0.85 246 0.2844 0.6551 0.0347 0.85 258 -0.7998 0.5153 0.0574 0.85 270 -0.4705 0.5387 0.0416 0.85 282 -0.3127 0.4464 0.0356 0.85 294 -0.0409 0.6637 0.0301 0.85 306 -0.5872 0.5672 0.0468 0.95 234 0.0514 0.5682 0.0302 0.95 270 0.2935 0.579 0.035 0.95 282 0.6252 0.6437 0.0486 0.95 294 0.5267 0.5945 0.044 0.95 306 1.0575 0.6278 0.0713