CLAS physics database search results Measurement E151M1585 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 246 0.6086 1.0704 0.0464 0.65 246 -1.1026 1.0521 0.0708 0.65 258 -0.8041 1.091 0.0556 0.75 114 2.3687 1.0665 0.141 0.75 234 0.7482 1.1291 0.0528 0.75 258 -0.9383 0.894 0.0623 0.85 246 1.4379 0.763 0.0888 0.85 258 -1.382 0.8923 0.0858 0.85 270 1.2852 1.1877 0.0805 0.95 258 0.8628 0.9448 0.0585 0.55 258 0.043 0.9012 0.0301 0.65 126 0.9203 0.947 0.0628 0.65 258 -0.3544 0.9194 0.0368 0.75 258 0.6717 0.8672 0.0502 0.85 126 -1.0865 0.8521 0.0717 0.85 138 -1.1809 0.8766 0.0769 0.85 246 1.1318 0.7814 0.0742 0.85 258 0.0537 0.7365 0.0302 0.95 258 -0.0492 0.7943 0.0301