CLAS physics database search results Measurement E151M1701 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 66 -0.1118 0.6137 0.0308 0.45 66 0.6952 0.6272 0.0517 0.45 78 0.1552 0.5577 0.0314 0.45 282 0.0678 0.5489 0.0303 0.55 78 -0.5674 0.547 0.0456 0.55 270 -0.1316 0.4607 0.031 0.55 282 -0.6207 0.5041 0.0481 0.65 258 0.3548 0.6402 0.0369 0.65 270 -0.6217 0.372 0.0482 0.65 282 0.5407 0.4793 0.0444 0.75 102 -0.5223 0.6111 0.0436 0.75 258 -0.2966 0.4906 0.035 0.75 270 -0.7914 0.3979 0.0566 0.75 282 0.6242 0.4445 0.0483 0.85 90 -0.5407 0.5235 0.0444 0.85 102 0.3738 0.5009 0.0376 0.85 114 0.5388 0.4113 0.0443 0.85 126 -0.0682 0.4445 0.0303 0.85 138 -0.2523 0.5831 0.0337 0.85 258 -0.4746 0.4657 0.0416 0.85 270 -0.1382 0.4823 0.0311 0.95 90 0.8501 0.4435 0.0596 0.95 102 0.2167 0.4313 0.0327 0.95 114 0.8932 0.4162 0.0619 0.95 126 -0.411 0.3979 0.039 0.95 138 -0.2407 0.4928 0.0334 0.95 150 1.1361 0.3719 0.0751 0.95 162 -0.7072 0.4586 0.0523 0.95 174 -0.4667 0.5024 0.0412 0.95 186 1.1877 0.4477 0.078 0.95 246 0.3632 0.5289 0.0372