CLAS physics database search results Measurement E151M977 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.55 66 0.2777 0.7844 0.0362 0.55 90 -0.0679 0.7115 0.0304 0.55 270 0.5321 0.7612 0.0491 0.65 66 -0.8384 0.5421 0.0682 0.65 90 -0.4867 0.6039 0.0465 0.65 270 -0.3084 0.6707 0.0375 0.65 282 -0.0144 0.7099 0.03 0.65 294 -0.5228 0.5828 0.0486 0.65 306 1.6157 0.8301 0.1218 0.75 78 -0.7712 0.5097 0.0639 0.75 90 1.0643 0.7452 0.0834 0.75 102 3.2446 3.2446 0.239 0.75 258 0.9503 0.6715 0.0757 0.75 270 -0.5469 0.6233 0.05 0.75 282 0.4354 0.5807 0.0437 0.75 294 -0.5068 0.5785 0.0477 0.75 306 -0.3009 0.5806 0.0372 0.75 318 0.4222 0.6859 0.043 0.85 234 -0.2303 0.6815 0.0344 0.85 258 1.757 0.7074 0.1319 0.85 270 -0.4054 0.4997 0.0422 0.85 282 0.5588 0.7363 0.0507 0.85 294 -0.4714 0.5725 0.0457 0.85 306 0.5252 0.6685 0.0487 0.95 90 0.2843 0.6164 0.0365