CLAS physics database search results Measurement E151M736 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.55 78 -0.3074 0.4036 0.0362 0.55 270 -0.1426 0.4457 0.0314 0.55 282 -0.5858 0.3125 0.0524 0.65 282 -2.379 1.6787 0.2216 0.75 90 -3.1057 2.1892 0.2882 0.75 270 -0.6 2.039 0.063 0.75 282 0.7219 2.1234 0.0731 0.85 90 -0.1579 2.8785 0.0334 0.85 102 0.0852 2.4386 0.031 0.95 114 -3.423 7.782 0.3173 0.95 126 -0.2536 7.5535 0.0381 0.95 138 2.1322 8.5642 0.1991 0.55 294 0.0865 0.4302 0.0305 0.65 270 -0.1712 0.3771 0.032 0.65 282 0.4618 0.3994 0.0426 0.75 270 0.1035 0.4537 0.0308 0.75 282 0.494 0.4275 0.0442 0.85 90 -0.6515 0.3723 0.0522 0.85 102 -0.0149 0.4604 0.03 0.85 114 -0.5786 0.4409 0.0484 0.85 270 -0.1264 0.4811 0.0311 0.85 282 0.3625 0.5056 0.0383 0.95 90 0.0361 0.7568 0.0301 0.95 102 -0.2001 0.7033 0.0327 0.95 114 0.9011 0.7025 0.0663 0.95 126 -0.4263 0.7285 0.041