CLAS physics database search results Measurement E151M1118 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.45 102 -0.0543 0.8132 0.0303 0.55 102 -1.4632 0.5359 0.1111 0.65 234 0.3222 0.801 0.0381 0.75 66 -0.1033 0.7783 0.0309 0.75 102 0.2518 0.8579 0.0352 0.75 222 1.3101 0.8323 0.1003 0.75 234 0.1841 0.7848 0.0329 0.85 54 0.0015 0.7281 0.03 0.85 66 -0.629 0.6828 0.0549 0.85 78 0.4366 0.8303 0.0438 0.85 210 -0.7185 0.7347 0.0605 0.85 222 -0.4256 0.6699 0.0432 0.85 234 2.5156 2.5156 0.1863 0.85 246 1.5083 0.8438 0.1143 0.85 258 -0.2051 0.615 0.0335 0.85 270 0.0549 0.7772 0.0303 0.85 282 -1.2677 0.5548 0.0974 0.95 210 0.2515 0.8448 0.0352 0.95 222 0.6271 0.8246 0.0548 0.95 234 -0.2018 0.692 0.0334 0.95 258 0.7149 0.857 0.0602 0.95 270 -0.0021 0.6008 0.03 0.95 294 0.7129 0.7524 0.0601 0.95 306 -0.1805 0.6071 0.0328