CLAS physics database search results Measurement E151M1958 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 78 -0.6257 0.4768 0.0506 0.55 270 -0.1404 0.5266 0.0314 0.55 282 -0.131 0.4181 0.0346 0.65 282 -2.4203 2.1495 0.2244 0.75 90 -2.5818 2.8745 0.2392 0.75 270 -2.6772 2.3428 0.2479 0.75 282 1.228 2.425 0.1168 0.85 90 2.9069 3.2954 0.2688 0.85 102 6.0291 2.4775 0.5549 0.95 114 1.0971 9.3167 0.1052 0.95 126 -6.2854 8.8062 0.5784 0.95 138 -0.0816 9.8022 0.0309 0.55 294 -0.192 0.49 0.0325 0.65 270 -1.1986 0.3894 0.0835 0.65 282 -0.5522 0.4342 0.0468 0.75 270 -0.2068 0.5197 0.0329 0.75 282 0.2331 0.4822 0.0336 0.85 90 -0.0491 0.4856 0.0302 0.85 102 0.9294 0.5065 0.0675 0.85 114 -0.8726 0.5287 0.0642 0.85 270 0.3075 0.5613 0.0361 0.85 282 0.6263 0.5695 0.0506 0.95 90 -0.3068 0.869 0.036 0.95 102 0.3366 0.8285 0.0371 0.95 114 0.1963 0.8088 0.0326 0.95 126 -1.193 0.8236 0.0832