CLAS physics database search results Measurement E151M290 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.65 222 -0.4812 0.5381 0.0423 0.65 234 -0.2027 0.5049 0.0325 0.65 246 -0.1154 0.5252 0.0308 0.75 138 -0.5555 0.61 0.0456 0.75 222 0.0162 0.6169 0.03 0.75 234 0.7675 0.5064 0.0562 0.75 246 -0.1448 0.548 0.0313 0.85 234 0.7078 0.545 0.0531 0.85 246 1.0556 0.5378 0.0719 0.55 246 -0.1279 0.8733 0.031 0.65 234 0.3224 0.7744 0.0357 0.75 234 1.0571 0.9757 0.0704 0.75 246 0.767 0.8305 0.0551 0.85 234 0.527 1.0304 0.0437