CLAS physics database search results Measurement E151M1608 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 30 0.5671 0.9027 0.0446 0.55 42 -1.7757 0.4436 0.1083 0.55 138 -0.9854 0.9518 0.0647 0.55 150 -1.2541 0.7292 0.0809 0.55 210 -1.4537 0.8475 0.0897 0.55 222 -0.7262 0.9222 0.0518 0.55 234 -0.3016 0.54 0.051 0.65 126 -1.3994 0.7258 0.0891 0.65 138 -1.2396 0.9696 0.0781 0.65 210 -0.5287 0.5822 0.0455 0.65 222 -0.1958 0.659 0.0322 0.75 210 -0.4375 0.8086 0.0393 0.75 222 0.0452 0.8805 0.0301 0.75 234 -1.3722 0.9854 0.0852 0.85 222 -1.0667 0.7705 0.0689 0.85 234 0.5238 0.8587 0.0428 0.65 234 0.3649 0.7485 0.0371 0.75 210 -0.1552 0.7805 0.0314 0.75 222 -0.5472 0.7296 0.0444 0.75 234 0.7279 0.6663 0.0529 0.85 126 0.7254 0.6897 0.0528 0.85 222 0.7888 0.7432 0.056 0.85 234 -0.3936 0.655 0.0382