CLAS physics database search results Measurement E151M646 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.45 282 -0.1116 0.7683 0.0308 0.55 282 0.7114 0.8254 0.0529 0.65 114 -0.4496 0.7184 0.0407 0.65 126 -0.6705 0.7308 0.0508 0.65 234 0.1793 0.7127 0.0319 0.65 294 -0.3044 0.5585 0.0353 0.75 114 -1.188 0.5817 0.0786 0.75 126 -0.204 0.7919 0.0325 0.75 138 -0.4341 0.7023 0.0401 0.75 198 0.0661 0.8266 0.0303 0.75 210 -0.4763 0.6383 0.0418 0.75 222 -0.1696 0.6201 0.0317 0.75 234 -0.4641 0.6415 0.0413 0.75 246 0.1197 0.7579 0.0309 0.75 294 0.1819 0.7422 0.032 0.85 90 0.2878 0.7134 0.0348 0.85 126 0.7529 0.8505 0.055 0.85 210 -1.3911 0.5911 0.0902 0.85 222 0.138 0.6203 0.0312 0.85 246 0.9545 0.5763 0.0656 0.85 258 0.0454 0.7586 0.0301 0.95 90 -0.0067 0.7011 0.03 0.95 102 -0.2081 0.7188 0.0326 0.95 222 -0.421 0.6443 0.0395 0.95 234 0.7314 0.7154 0.0539 0.95 246 0.8267 0.7765 0.0588 0.95 258 -0.3494 0.652 0.0368