CLAS physics database search results Measurement E151M1326 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 54 -0.111 1.0409 0.0325 0.55 54 0.6416 0.8792 0.0783 0.55 234 -1.0664 0.9055 0.124 0.55 246 0.3465 0.7815 0.0493 0.65 54 0.2685 0.9183 0.0426 0.65 222 -0.2437 0.8407 0.0407 0.65 234 -0.1141 0.7194 0.0326 0.65 246 0.5344 0.7416 0.0673 0.65 258 0.1826 0.876 0.0364 0.75 222 -0.6936 0.8803 0.0838 0.75 234 0.9553 0.8491 0.1118 0.75 246 0.4995 0.6374 0.0638 0.85 234 0.4836 0.7112 0.0623 0.85 246 -0.6181 0.6739 0.0759