CLAS physics database search results Measurement E151M100 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.55 258 -0.3532 0.6374 0.0502 0.55 270 -0.8324 0.5213 0.0993 0.65 246 -0.8079 0.4639 0.0967 0.65 258 -0.6301 0.5769 0.0777 0.65 270 0.1143 0.5743 0.0327 0.65 282 -0.2161 0.6591 0.0388 0.75 138 -1.1961 0.5918 0.1393 0.75 150 -0.1649 0.75 0.0354 0.75 246 -0.0598 0.5701 0.0308 0.75 258 0.7429 0.7002 0.0897 0.75 270 0.1505 0.5895 0.0345 0.75 282 0.6915 0.6254 0.0842 0.75 294 -0.359 0.7058 0.0507 0.85 126 0.1889 0.7187 0.0369 0.85 138 -0.4399 0.5951 0.0583 0.85 150 -0.2035 0.6513 0.0379 0.85 162 1.1685 0.6648 0.1363 0.85 186 0.8649 0.6712 0.1029 0.85 246 -0.0604 0.6962 0.0308 0.85 258 -0.088 0.5524 0.0316 0.85 270 0.5401 0.6153 0.0684 0.85 282 -0.9285 0.4495 0.1098 0.85 294 -0.2612 0.6304 0.0422 0.95 102 -0.2219 0.63 0.0392 0.95 114 1.8563 0.7637 0.2133 0.95 138 1.1937 0.6611 0.1391 0.95 162 -0.286 0.5654 0.0443 0.95 174 -0.7715 0.5057 0.0928 0.95 258 -0.3228 0.5512 0.0474