CLAS physics database search results Measurement E151M1996 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.75 90 0.1832 1.7028 0.0344 0.75 102 1.3075 1.6861 0.1239 0.75 246 2.5747 1.4942 0.2385 0.85 90 -1.3523 1.739 0.1279 0.85 282 0.0137 1.6027 0.03 0.85 294 1.9433 1.3646 0.1811 0.85 306 3.3135 1.3525 0.306 0.65 102 0.1509 0.5818 0.0316 0.65 258 0.391 0.6697 0.0393 0.65 270 -0.7122 0.6136 0.0552 0.75 102 0.7929 0.6135 0.0597 0.85 78 -0.5637 0.6618 0.0474 0.85 90 0.9989 0.6426 0.0716 0.85 102 0.4996 0.7404 0.0442 0.85 114 -0.6691 0.7199 0.0529 0.85 270 1.1961 0.5792 0.0834 0.85 282 -0.0621 0.5977 0.0303 0.85 294 -0.0342 0.5561 0.0301 0.95 258 0.9809 1.0628 0.0705 0.95 282 -0.3289 1.0841 0.0368