CLAS physics database search results Measurement E151M840 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.75 90 1.539 1.2996 0.1452 0.75 102 -2.798 0.7957 0.26 0.75 126 1.1488 1.4107 0.1102 0.75 234 -1.0974 0.983 0.1056 0.75 258 -1.1117 0.8617 0.1069 0.85 258 0.3438 1.2811 0.0437 0.85 270 -1.8519 0.8645 0.1735 0.95 270 4.5086 3.5764 0.4172 0.95 282 -3.0246 2.9547 0.2808 0.95 294 0.7002 2.7076 0.0712 0.65 102 0.2233 0.6614 0.0334 0.75 114 -0.6681 0.5403 0.0531 0.75 234 0.085 0.6218 0.0305 0.85 126 -0.6241 0.6995 0.0508 0.85 234 0.784 0.8332 0.0596 0.85 246 -0.6409 0.5372 0.0517 0.85 258 0.7646 0.7337 0.0585 0.85 270 0.2377 0.6978 0.0338 0.95 270 2.9685 1.0919 0.1971