CLAS physics database search results Measurement E151M347 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.55 222 -0.1446 0.6798 0.0313 0.55 234 0.3417 0.4766 0.0368 0.65 138 -1.1436 0.7105 0.0751 0.65 222 1.4708 0.6483 0.0959 0.65 234 0.2936 0.5276 0.0358 0.75 162 0.5908 1.2553 0.0465 0.75 222 0.7743 1.1569 0.0554 0.75 234 0.4316 0.9441 0.0397 0.85 210 -0.3882 0.7986 0.038 0.85 222 -0.5066 0.6849 0.0428 0.85 234 -1.0974 0.5452 0.0726 0.65 246 -0.5611 0.6482 0.0459 0.75 234 0.9719 0.5256 0.0672 0.75 246 0.996 0.6562 0.0686 0.85 234 -0.4733 0.6441 0.0419