CLAS physics database search results Measurement E151M1891 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 78 -0.4772 0.8955 0.0417 0.45 78 1.4375 0.8293 0.0921 0.45 90 1.5902 0.8422 0.1009 0.45 138 -0.2806 0.9323 0.0345 0.45 270 0.0221 0.8395 0.03 0.45 282 -0.2285 0.8863 0.033 0.55 78 -1.5085 0.7695 0.0962 0.55 198 -1.3353 0.9104 0.0863 0.55 210 0.3192 0.7651 0.0357 0.55 270 -0.7305 0.6533 0.0535 0.55 282 -0.1188 0.8509 0.0309 0.65 126 -1.4615 0.7344 0.0935 0.65 138 -0.7587 0.7528 0.0549 0.65 150 -0.9197 0.9589 0.0633 0.65 210 -2.0045 0.7031 0.1251 0.65 222 -0.1795 0.8042 0.0319 0.65 282 0.0205 0.8267 0.03 0.75 66 -0.2798 0.8633 0.0345 0.75 78 0.0453 0.8704 0.0301 0.75 210 -0.2557 0.7194 0.0338 0.75 222 0.1443 0.7055 0.0312 0.75 270 1.1213 0.6086 0.0743 0.75 282 0.6024 0.7056 0.0472 0.75 294 0.502 0.8487 0.0427 0.85 114 -0.641 0.7661 0.0491 0.85 126 0.0321 0.6417 0.0301 0.85 138 -1.0335 0.7725 0.0694 0.85 198 -0.2628 0.7947 0.034 0.85 210 0.4076 0.7404 0.0389 0.85 222 0.2865 0.7313 0.0347