CLAS physics database search results Measurement E151M1638 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 138 -0.0428 0.9206 0.0301 0.55 222 -1.1532 0.9423 0.0753 0.55 234 -0.3262 0.9022 0.0358 0.55 246 -0.1829 0.7758 0.0324 0.65 138 -0.6113 0.94 0.0474 0.65 162 -1.3088 0.9657 0.084 0.65 222 1.6526 0.8367 0.1007 0.65 234 0.4022 0.6247 0.0843 0.65 246 0.3578 0.702 0.0368 0.75 126 0.2865 0.8735 0.0346 0.75 138 -1.0334 0.7695 0.0684 0.75 150 0.418 0.7739 0.0391 0.75 234 -0.4901 0.6489 0.0748 0.75 246 0.2127 0.5562 0.0493 0.75 258 -0.1588 0.5704 0.0591 0.85 210 0.2128 1.2081 0.0325 0.85 222 -0.6688 0.6582 0.0499 0.85 234 0.3553 0.725 0.0375 0.85 246 0.3049 0.5068 0.0836 0.85 258 0.0306 0.6519 0.0556 0.95 114 0.7139 1.0793 0.0512