CLAS physics database search results Measurement E151M1431 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 282 -0.1037 0.4047 0.0306 0.55 270 0.1008 0.7174 0.0306 0.55 282 0.9702 0.5891 0.0639 0.55 294 -0.0213 0.7248 0.03 0.65 270 -0.8608 0.6352 0.0584 0.65 282 0.1141 0.5865 0.0307 0.75 270 0.0203 0.7302 0.03 0.75 282 0.3164 0.6916 0.0352 0.85 126 -0.3705 0.7276 0.0369 0.85 138 -0.1732 0.7946 0.0316 0.85 282 -0.0389 0.7412 0.0301 0.95 102 0.9752 0.4803 0.0642 0.95 114 -0.8693 0.6101 0.0588 0.95 126 -1.0413 0.5772 0.0676 0.95 138 0.939 0.511 0.0623 0.95 150 0.3791 0.6522 0.0372 0.95 162 -0.0163 0.6624 0.03 0.95 174 0.8388 0.5354 0.0573 0.95 186 0.8756 0.584 0.0591 0.95 198 0.7038 0.543 0.0507 0.95 210 -0.806 0.599 0.0556 0.45 294 -0.9278 0.5522 0.0632 0.55 270 -0.3104 0.4594 0.0353 0.55 282 -0.3864 0.464 0.0379 0.55 294 -0.5726 0.4952 0.0456 0.65 270 0.4966 0.4937 0.0423 0.65 282 -0.2622 0.5768 0.0339 0.75 270 0.0505 0.4389 0.0302 0.75 282 0.9474 0.539 0.0642 0.95 102 0.0569 0.5616 0.0302 0.95 114 0.3883 0.5208 0.038 0.95 138 0.5628 0.4718 0.0451 0.95 174 -0.7857 0.499 0.0558 0.95 186 0.2116 0.4663 0.0326 0.95 210 -0.5958 0.4451 0.0466 0.95 222 0.0889 0.4845 0.0305