CLAS physics database search results Measurement E151M2142 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 270 -0.0106 0.6089 0.0445 0.55 258 3.7228 1.6845 0.3434 0.65 126 -0.7277 2.2992 0.0733 0.75 210 -1.7535 1.9628 0.1639 0.75 222 -1.7436 2.0741 0.163 0.75 270 -1.5171 1.9842 0.1426 0.75 282 -0.945 1.5293 0.0919 0.85 210 0.5571 1.8742 0.0593 0.85 234 -4.4643 1.8346 0.4114 0.45 282 -1.0221 0.5962 0.0729 0.55 114 -1.3079 0.583 0.0902 0.55 270 -1.0194 0.6935 0.0728 0.55 282 0.0486 0.6532 0.0302 0.65 114 -1.6994 0.6199 0.1145 0.65 126 -1.1887 0.5893 0.0829 0.65 138 -0.1034 0.7331 0.0307 0.65 210 0.4417 0.7286 0.0415 0.65 222 -0.4058 0.7219 0.04 0.75 198 -0.0507 0.7915 0.0302 0.75 210 -1.3874 0.7995 0.0951 0.75 222 -1.2403 0.6885 0.0861 0.75 270 -0.5146 0.6128 0.045 0.75 282 -0.6841 0.5509 0.0537 0.85 114 1.4765 0.7413 0.1006 0.85 126 0.6562 0.7273 0.0522 0.85 210 -0.1496 0.7489 0.0315 0.85 222 -0.1531 0.8237 0.0316