CLAS physics database search results Measurement E151M2177 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 282 -0.4085 0.6892 0.0422 0.35 294 0.9429 0.6325 0.0747 0.45 282 -0.2232 0.5925 0.0341 0.55 270 -0.7213 0.646 0.0603 0.55 282 0.6187 0.5834 0.054 0.55 294 0.1084 0.5882 0.031 0.65 78 -0.6252 0.6504 0.0544 0.65 90 1.0757 0.6499 0.0836 0.65 270 -0.1371 0.678 0.0316 0.65 282 0.7382 0.5852 0.0614 0.65 294 -0.0003 0.6076 0.03 0.65 306 0.1187 0.6302 0.0312 0.75 66 -0.2604 0.6238 0.0354 0.75 78 0.1247 0.5923 0.0313 0.75 90 0.3762 0.6974 0.0406 0.75 102 -0.1841 0.7445 0.0328 0.75 258 0.0676 0.6825 0.0304 0.75 270 0.077 0.7191 0.0305 0.75 282 0.1091 0.5479 0.031 0.75 294 0.0421 0.6159 0.0302 0.75 306 -0.4145 0.6327 0.0425 0.85 54 0.9235 0.7024 0.0734 0.85 66 1.0141 0.6417 0.0794 0.85 78 -0.1087 0.5834 0.031 0.85 90 -0.7324 0.5491 0.061 0.85 102 -0.2655 0.6122 0.0356 0.85 270 0.0219 0.6446 0.03 0.85 294 -0.4852 0.6873 0.0462 0.85 306 0.9884 0.5447 0.0777 0.85 318 0.6811 0.7723 0.0578 0.95 54 -0.5179 0.6769 0.0481 0.95 66 0.0592 0.6376 0.0303 0.95 90 0.9726 0.6601 0.0766 0.95 270 -0.2063 0.6989 0.0335