CLAS physics database search results Measurement E151M306 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.75 126 0.8303 1.2526 0.0583 0.75 138 -0.1255 1.0271 0.0309 0.75 234 1.6189 1.3241 0.102 0.75 270 0.7098 0.8968 0.0522 0.85 126 0.7134 1.2265 0.0524 0.85 234 -1.0671 0.5771 0.0709 0.85 258 -0.4383 0.6626 0.04 0.85 270 0.8277 1.0479 0.0582 0.85 294 1.7342 1.146 0.1087 0.95 126 -0.0527 0.8814 0.0302 0.95 294 1.5968 0.9536 0.1007 0.65 270 -0.5914 0.5897 0.0473 0.65 282 0.1459 0.6449 0.0313 0.75 138 0.1309 0.6752 0.0311 0.75 246 -0.1422 0.5776 0.0313 0.75 258 -0.5074 0.5404 0.0434 0.75 270 0.1945 0.5891 0.0323 0.85 114 -0.7352 0.6455 0.0545 0.85 126 1.463 0.5626 0.0954 0.85 138 -0.1868 0.646 0.0322 0.85 150 0.4732 0.6871 0.0419 0.85 258 -0.9252 0.5265 0.0647 0.85 270 -0.3096 0.5809 0.0356 0.85 282 0.3983 0.571 0.0388 0.85 294 -0.3053 0.6236 0.0355 0.95 78 0.1356 0.5946 0.0312