CLAS physics database search results Measurement E151M211 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.35 282 0.7142 0.429 0.0534 0.45 282 -0.0511 0.4431 0.0302 0.55 270 -0.4657 0.4442 0.0416 0.55 282 -0.1651 0.3529 0.0317 0.55 294 0.2701 0.4564 0.0343 0.65 282 -0.379 0.3932 0.0381 0.75 270 -0.4384 0.4495 0.0405 0.85 90 -0.0323 0.4882 0.0301 0.95 102 0.0888 0.3885 0.0305 0.95 114 -0.3788 0.3737 0.0381 0.95 150 -0.1749 0.3478 0.0319 0.35 294 0.935 1.034 0.0638 0.45 282 0.0362 0.6856 0.0301 0.45 294 -0.2134 0.5757 0.0326 0.55 270 -0.4365 0.4893 0.0399 0.55 282 -0.8407 0.3358 0.0588 0.55 294 -0.29 0.5666 0.0347 0.65 282 0.3319 0.5745 0.036 0.65 294 -0.4329 0.4825 0.0397 0.75 270 -0.3115 0.5426 0.0354 0.85 114 1.3874 0.982 0.0888 0.85 126 0.693 0.8661 0.0514 0.95 102 0.933 0.6882 0.0637 0.95 114 0.1007 0.6401 0.0306