CLAS physics database search results Measurement E151M1234 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 282 -0.3877 0.494 0.053 0.55 270 -0.0212 0.375 0.0301 0.55 282 0.0664 0.4056 0.0309 0.65 258 0.446 0.4712 0.0586 0.65 270 -0.7246 0.3372 0.0871 0.65 282 0.4642 0.4156 0.0603 0.75 258 -0.2166 0.4674 0.0387 0.75 270 -0.5327 0.3903 0.0672 0.75 282 -0.391 0.5012 0.0533 0.85 150 -0.1888 0.4209 0.0368 0.85 162 0.7308 0.4171 0.0877 0.85 174 -0.232 0.4154 0.0398 0.85 186 0.5865 0.3374 0.0726 0.85 198 0.3889 0.4462 0.0531 0.85 210 -0.5321 0.3831 0.0671 0.85 222 0.9382 0.3961 0.11 0.85 246 -0.469 0.4911 0.0608 0.85 258 -0.2255 0.4584 0.0393 0.95 150 0.5285 0.433 0.0667 0.95 162 0.7184 0.3307 0.0864 0.95 174 0.6679 0.3251 0.0811 0.95 186 0.1836 0.3696 0.0365 0.95 198 0.8119 0.315 0.0964 0.95 210 -0.1642 0.4391 0.0353 0.95 222 0.6568 0.3613 0.0799