CLAS physics database search results Measurement E151M1551 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 222 -0.5024 0.5237 0.0945 0.65 138 -1.4535 0.7126 0.0921 0.65 222 -0.3258 0.7385 0.0358 0.65 234 0.2726 0.6258 0.0342 0.65 246 0.3698 0.7527 0.0373 0.75 150 -0.6996 0.7959 0.0516 0.75 222 0.5465 0.8356 0.0444 0.75 234 -2.3025 2.3025 0.1412 0.85 222 0.6082 0.8303 0.0472 0.85 234 0.6327 0.8281 0.0484 0.85 246 -0.3179 0.8045 0.0355 0.55 234 2.145 0.6631 0.1283 0.65 222 0.271 1.2298 0.0339 0.65 234 -1.3386 0.9003 0.0834 0.65 246 1.3998 0.7936 0.0867 0.75 138 0.1879 1.1369 0.0319 0.75 234 -0.9868 0.868 0.0648 0.85 210 0.4119 1.0231 0.0384 0.85 222 0.5768 0.9103 0.045 0.85 234 0.702 0.794 0.0507 0.85 246 -0.8029 0.848 0.0555