CLAS physics database search results Measurement E151M424 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.45 30 -0.0948 0.6727 0.0306 0.45 42 -0.1285 0.6196 0.035 0.55 42 -0.9619 0.6805 0.0667 0.55 162 0.6194 0.7566 0.0487 0.65 222 0.3559 0.7481 0.0372 0.65 234 0.0455 0.6609 0.0301 0.75 222 0.245 0.6502 0.0336 0.75 234 0.3681 0.6585 0.0377 0.75 246 -0.2727 0.7125 0.0344 0.85 138 -0.6354 0.6075 0.0495 0.85 234 0.1499 0.6782 0.0314 0.55 222 -0.0265 1.0479 0.03 0.55 234 3.8314 3.8314 0.2327 0.65 138 0.6151 1.3834 0.0477 0.65 150 -1.289 0.7346 0.0832 0.65 210 -0.9569 0.7398 0.065 0.65 222 1.9773 1.3923 0.1228 0.65 234 1.5718 1.5269 0.0993 0.75 210 -0.4496 0.875 0.0404 0.75 222 0.7904 1.011 0.0563 0.75 234 0.0454 1.012 0.0301 0.75 246 0.3586 1.3013 0.037 0.85 138 -1.0593 0.6794 0.0705 0.85 210 1.8553 1.3839 0.1157 0.85 222 0.0549 0.8673 0.0302 0.85 234 -0.5583 0.7292 0.0451