CLAS physics database search results Measurement E151M1422 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 270 0.0269 0.4461 0.0318 0.65 258 -0.0773 0.3814 0.0307 0.65 270 -0.7437 0.303 0.0554 0.75 150 -0.0662 0.8867 0.0302 0.75 162 0.4395 0.6412 0.0399 0.75 186 -0.1861 0.7513 0.0319 0.75 246 -0.3579 0.4133 0.048 0.75 258 0.4438 0.3794 0.0407 0.75 270 0.508 0.4359 0.0426 0.85 150 0.6207 0.49 0.0517 0.85 162 0.0446 0.4197 0.0652 0.85 174 0.0399 0.381 0.0302 0.85 186 -0.1208 0.4641 0.0349