CLAS physics database search results Measurement E151M205 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.45 282 0.1772 0.4525 0.0347 0.55 270 -0.4107 0.2782 0.0396 0.55 282 -0.1204 0.3399 0.0311 0.65 258 -0.4011 0.2963 0.0388 0.65 270 -0.2557 0.2606 0.0338 0.65 282 -0.3104 0.2884 0.0499 0.75 258 -0.1641 0.3036 0.0327 0.75 270 -0.0302 0.3003 0.0337 0.85 114 -0.6857 0.4814 0.051 0.85 126 0.4224 0.3894 0.0397 0.85 138 0.0729 0.3284 0.0324 0.85 150 0.489 0.3468 0.0444 0.85 162 -0.2266 0.254 0.0367 0.85 174 -0.3532 0.3027 0.0375 0.85 186 -0.7316 0.3031 0.0636 0.85 198 0.0246 0.3195 0.0348 0.85 210 -0.4409 0.3341 0.0566 0.95 138 0.3307 0.409 0.0363 0.95 150 -0.2106 0.3442 0.0327 0.95 162 0.6165 0.4034 0.0486 0.95 174 0.0894 0.3403 0.0305 0.95 186 -0.1384 0.3685 0.0312 0.95 198 -0.6142 0.3499 0.0484 0.85 270 -0.7717 0.3567 0.0553 0.95 138 -0.0579 0.4705 0.0302 0.95 150 0.7218 0.6871 0.0528 0.95 162 0.0717 0.5236 0.0303 0.95 174 0.2321 0.5934 0.0331 0.95 186 -0.8205 0.2599 0.0578 0.95 198 2.1328 2.1328 0.1319