CLAS physics database search results Measurement E151M1106 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.55 90 -0.6182 0.7998 0.0542 0.65 102 -0.3547 0.8562 0.0397 0.65 114 -1.8609 0.5835 0.1393 0.75 234 -0.3764 0.7633 0.0407 0.75 258 0.8712 0.9746 0.0704 0.85 66 0.9039 0.9824 0.0726 0.85 78 1.4448 1.0353 0.1098 0.85 222 -0.6818 0.7491 0.0582 0.85 234 0.3373 0.7786 0.0388 0.85 246 -0.5229 0.6339 0.0486 0.85 258 0.7176 0.7806 0.0604 0.85 270 -0.3151 0.8339 0.0378 0.85 282 1.0556 0.947 0.0828 0.95 234 -0.2352 0.6684 0.0346 0.95 246 0.7206 0.8103 0.0606 0.95 258 -0.1113 0.7645 0.0311 0.95 270 -0.3058 0.7036 0.0374 0.95 282 -0.3009 0.6945 0.0372 0.95 294 -0.0358 0.6866 0.0301 0.95 306 0.3948 0.7693 0.0416 0.95 318 0.2284 0.7754 0.0343