CLAS physics database search results Measurement E151M1723 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 306 0.0879 0.7179 0.0305 0.45 66 -0.1408 0.7307 0.0312 0.45 78 -1.038 0.647 0.0697 0.55 78 -0.8629 0.5902 0.0603 0.55 90 -0.705 0.583 0.0522 0.65 78 -0.5387 0.6827 0.0443 0.65 90 0.266 0.6225 0.0341 0.65 246 -0.7903 0.5608 0.0565 0.65 258 0.1361 0.4792 0.0311 0.65 270 0.4288 0.604 0.0397 0.75 114 0.0558 0.6932 0.0302 0.75 126 -0.6757 0.6339 0.0508 0.75 138 -0.5444 0.6555 0.0446 0.75 150 -0.1622 0.6967 0.0316 0.75 234 1.5127 0.4681 0.0964 0.75 246 -0.1151 0.4784 0.0308 0.75 258 -0.379 0.4135 0.0378 0.75 270 0.9075 0.522 0.0626 0.85 126 -0.2931 0.6561 0.0349 0.85 138 0.01 0.7467 0.03 0.85 150 0.6109 0.6366 0.0476 0.85 222 -0.2058 0.6445 0.0325 0.85 234 -0.0892 0.5602 0.0305 0.85 246 0.6527 0.4932 0.0496 0.85 258 -0.1135 0.4904 0.0308