CLAS physics database search results Measurement E151M2340 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 102 -0.6697 0.9354 0.0571 0.55 102 -0.832 0.8175 0.0674 0.65 234 0.1171 0.8951 0.0312 0.75 66 -0.2006 0.9121 0.0333 0.75 102 -0.4911 0.9582 0.0466 0.75 222 0.1664 0.8753 0.0323 0.75 234 0.0981 0.8852 0.0308 0.85 54 0.2849 0.8387 0.0364 0.85 66 0.3429 0.8589 0.039 0.85 78 -0.1789 0.9159 0.0327 0.85 210 -0.3529 0.9481 0.0394 0.85 222 0.2625 0.8205 0.0355 0.85 234 -0.6347 0.8428 0.0549 0.85 246 0.7481 0.8824 0.062 0.85 258 -0.6979 0.7142 0.0588 0.85 270 -0.0108 0.891 0.03 0.85 282 -1.5559 0.6966 0.1167 0.95 210 1.5864 0.8339 0.1189 0.95 222 0.6724 0.8426 0.0572 0.95 234 -0.7997 0.7983 0.0653 0.95 258 -0.3981 0.907 0.0416 0.95 270 1.2694 0.6446 0.0968 0.95 294 0.5679 0.8236 0.0509 0.95 306 0.2437 0.7198 0.0348