CLAS physics database search results Measurement E151M2387 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.65 114 -0.9014 1.017 0.0719 0.75 90 -1.2402 1.0357 0.0948 0.75 102 -1.8188 1.0517 0.1353 0.75 198 -1.4419 1.0666 0.1088 0.75 210 0.6239 1.0455 0.0543 0.75 222 -0.6516 0.9127 0.056 0.75 294 0.9798 0.9639 0.0771 0.85 78 -0.2017 1.0308 0.0334 0.85 90 0.3926 0.7588 0.0414 0.85 102 -0.4003 0.7916 0.0417 0.85 114 0.4436 0.8548 0.044 0.85 186 -0.8341 0.9754 0.0675 0.85 198 -0.8719 0.7041 0.07 0.85 210 0.1771 0.7392 0.0326 0.85 222 -0.6105 0.6551 0.0535 0.85 234 0.3105 0.9353 0.0375 0.85 246 0.1445 1.0176 0.0318 0.95 102 -0.923 0.961 0.0733 0.95 114 1.5396 0.8085 0.1156 0.95 186 0.1013 1.0739 0.0309 0.95 198 -0.4338 0.9611 0.0435 0.95 210 -0.5705 0.8622 0.0511 0.95 222 -0.5861 0.7523 0.052 0.95 234 -0.0831 0.9793 0.0306