CLAS physics database search results Measurement E151M637 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.35 78 -0.2499 0.712 0.0337 0.35 270 -0.3737 0.6888 0.0377 0.35 282 0.4078 0.7262 0.039 0.45 78 1.1543 0.8018 0.0767 0.45 270 2.1483 0.7816 0.1348 0.55 90 1.0591 1.0238 0.0714 0.55 138 -0.5739 0.7968 0.0462 0.55 222 2.0081 0.7253 0.1264 0.55 270 1.2322 0.8151 0.0811 0.55 282 -0.2948 0.6506 0.035 0.65 126 -0.645 0.7161 0.0496 0.65 138 0.5433 0.6128 0.0448 0.65 198 0.3334 0.8194 0.0363 0.65 210 0.8188 0.6565 0.0584 0.65 222 -0.281 0.6491 0.0346 0.65 270 0.346 0.7879 0.0367 0.75 78 0.5202 0.7978 0.0437 0.75 126 -0.9107 0.7133 0.0633 0.75 138 0.4083 0.7659 0.039 0.75 210 0.1823 0.6343 0.032 0.75 222 0.6638 0.7614 0.0505 0.75 234 -0.6405 0.6112 0.0493 0.75 270 -0.0878 0.7647 0.0305 0.75 282 -0.844 0.5788 0.0597 0.85 114 -0.2975 0.694 0.0351 0.85 126 -1.2995 0.5656 0.085 0.85 210 0.3783 0.6415 0.0379 0.85 222 0.1076 0.7935 0.0307 0.85 234 0.651 0.6503 0.0499