CLAS physics database search results Measurement E151M304 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.55 258 0.7545 0.4771 0.0632 0.55 270 0.2399 0.5106 0.0352 0.65 126 -0.1323 0.504 0.0423 0.65 234 -0.6525 0.57 0.0503 0.65 246 -0.8074 0.369 0.0579 0.65 258 -0.0078 0.4036 0.0305 0.65 270 -0.3719 0.4077 0.0377 0.75 102 0.1448 0.5956 0.0313 0.75 114 -0.4995 0.3892 0.0547 0.75 126 -0.1648 0.4325 0.0451 0.75 138 -0.0325 0.4994 0.0301 0.75 222 -0.6327 0.5981 0.0493 0.75 234 -0.526 0.3341 0.0501 0.75 246 0.3943 0.4192 0.0461 0.75 258 -0.2776 0.4134 0.0491 0.75 270 0.0827 0.444 0.0308 0.75 282 -0.6292 0.4252 0.049 0.85 102 0.0977 0.5217 0.0353 0.85 114 0.0973 0.4156 0.0406 0.85 126 0.0392 0.4434 0.0361 0.85 138 -0.3075 0.3711 0.0504 0.85 150 -0.4629 0.4704 0.0478 0.85 162 -0.052 0.9478 0.0302 0.85 234 -0.7867 0.3991 0.0574 0.85 246 -0.1741 0.4348 0.0335 0.85 258 0.7254 0.4581 0.0537 0.85 270 0.1581 0.3776 0.0322 0.85 282 0.0262 0.319 0.031 0.85 294 -1.0137 0.3221 0.07 0.95 78 0.343 0.4416 0.0382 0.95 90 -0.1115 0.4304 0.0353 0.95 102 -0.6877 0.5339 0.0521 0.95 126 -0.2374 0.8379 0.0332 0.95 138 0.1563 0.5496 0.0315 0.95 150 -0.4803 0.5165 0.0422 0.95 174 0.7661 0.5709 0.0561 0.95 234 0.3252 0.4445 0.0381 0.95 246 2.8275 2.8275 0.1729 0.95 258 0.73 0.4222 0.0539 0.95 270 -0.4648 0.3809 0.0414 0.95 282 -0.577 0.3687 0.0468 0.95 294 -0.7648 0.259 0.0679