CLAS physics database search results Measurement E151M940 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.55 282 0.6642 0.6198 0.0571 0.65 270 -0.5155 0.5294 0.0482 0.65 282 -0.2395 0.4442 0.0347 0.65 294 0.5856 0.6683 0.0523 0.75 270 0.4373 0.5535 0.0438 0.75 282 -0.593 0.4182 0.0527 0.85 66 0.5415 0.7043 0.0497 0.85 78 -0.0636 0.4671 0.0304 0.85 90 -1.0681 0.3991 0.0836 0.85 102 0.3662 0.5489 0.0402 0.85 114 -1.1459 0.4717 0.089 0.85 270 0.3475 0.6355 0.0393 0.85 282 0.1567 0.683 0.0321 0.95 54 0.504 0.6611 0.0475 0.95 78 0.0028 0.5029 0.03 0.95 90 -0.3443 0.4334 0.0392 0.95 102 0.3055 0.5195 0.0374 0.95 114 0.3605 0.5958 0.0399 0.95 126 -0.5623 0.4358 0.0509 0.95 138 1.0841 0.8952 0.0847