CLAS physics database search results Measurement E151M2141 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.65 126 0.4792 2.1033 0.0533 0.75 210 1.399 2.0947 0.132 0.75 258 -1.4702 1.7408 0.1384 0.75 282 -3.7585 1.6077 0.3467 0.85 114 -0.7027 2.3441 0.0712 0.85 126 -2.6042 2.4883 0.2412 0.45 270 0.5521 0.6364 0.0468 0.55 210 0.4555 0.7799 0.0422 0.55 270 -0.4924 0.6381 0.0439 0.65 138 -0.6681 0.7333 0.0528 0.75 66 -0.2402 0.6501 0.0338 0.75 198 -0.3354 0.862 0.0371 0.75 210 -0.0154 0.7916 0.03 0.85 126 -0.493 0.8339 0.0439 0.85 222 0.1939 0.8688 0.0325 0.85 270 0.3394 0.7073 0.0373