CLAS physics database search results Measurement E151M1648 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 30 -0.0073 0.8737 0.03 0.45 42 -0.6756 0.6707 0.0673 0.55 138 -2.8394 2.8394 0.1678 0.55 150 0.4282 1.1554 0.039 0.55 162 -0.0136 0.9092 0.03 0.55 210 0.1783 1.3009 0.0317 0.55 222 -0.4414 0.6538 0.0418 0.55 234 -1.9112 1.1032 0.1151 0.65 150 0.2184 1.3343 0.0326 0.65 210 -1.0973 1.018 0.0705 0.65 222 -0.117 1.2332 0.0308 0.65 234 -2.0718 0.8748 0.1242 0.75 222 0.8263 0.9318 0.0566 0.75 234 -0.3043 1.1863 0.0348 0.75 246 -1.8381 1.0532 0.111 0.85 222 -1.0868 0.9713 0.07 0.85 234 -0.1337 1.0934 0.031 0.85 246 1.0475 0.9503 0.0679 0.55 246 -1.679 0.8186 0.105 0.65 138 -1.6078 0.8532 0.1009 0.65 150 -1.9871 0.8253 0.1228 0.65 222 -1.0279 0.8018 0.0685 0.75 138 -0.8698 0.8686 0.0601 0.75 210 -0.1773 0.9404 0.0318 0.75 222 -0.1508 0.8781 0.0313 0.75 234 1.8445 0.7978 0.1145 0.75 246 -1.0174 0.8252 0.068 0.85 210 1.2486 0.8909 0.0806 0.85 222 -0.3318 0.8665 0.036 0.85 234 1.3151 0.6973 0.0843 0.85 246 -0.0934 0.8243 0.0305