CLAS physics database search results Measurement E151M1165 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.65 114 -2.0122 0.6212 0.1501 0.75 90 -1.0109 0.7794 0.0797 0.75 102 0.6108 1.0332 0.0538 0.75 198 2.1117 1.0568 0.1572 0.75 210 0.9185 1.0106 0.0735 0.75 222 0.0385 0.8194 0.0301 0.75 294 -0.2334 0.8338 0.0345 0.85 78 -0.2351 0.8608 0.0346 0.85 90 -0.3373 0.6378 0.0388 0.85 102 -0.9399 0.5969 0.075 0.85 114 -0.4071 0.7078 0.0423 0.85 186 0.383 0.8679 0.041 0.85 198 -0.4833 0.5751 0.0463 0.85 210 -0.9935 0.5459 0.0786 0.85 222 -0.7152 0.5212 0.0603 0.85 234 -0.1725 0.7977 0.0325 0.85 246 -0.5272 0.8217 0.0488 0.95 102 -0.5788 0.7872 0.0519 0.95 114 0.0829 0.84 0.0306 0.95 186 -0.0921 0.9113 0.0307 0.95 198 -0.2618 0.8085 0.0356 0.95 210 0.8254 0.8144 0.0674 0.95 222 -0.5792 0.6064 0.0519 0.95 234 0.8421 0.9128 0.0685