CLAS physics database search results Measurement E151M1646 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 30 0.0851 0.8822 0.0304 0.45 42 -1.4365 0.6737 0.1036 0.55 42 -0.1469 0.9151 0.0313 0.55 162 -0.7624 1.01 0.0547 0.65 222 -0.0532 0.9879 0.0302 0.65 234 -1.8599 0.7798 0.1154 0.75 222 -2.6696 2.6696 0.1628 0.75 234 -0.4826 0.8726 0.0417 0.75 246 -1.4128 0.8702 0.0898 0.85 138 -1.3503 0.7483 0.0863 0.85 234 0.0272 0.894 0.03 0.55 222 0.082 1.2548 0.0304 0.55 234 -2.0673 1.0625 0.1239 0.65 138 -2.2217 0.8813 0.1326 0.65 150 -0.3735 1.3134 0.037 0.65 210 0.2823 1.1604 0.0342 0.65 222 -1.5017 1.0205 0.0923 0.65 234 0.9508 1.1457 0.0629 0.75 210 -0.4598 1.191 0.0402 0.75 222 -0.2978 1.0538 0.0346 0.75 234 -0.0565 1.1928 0.0302 0.75 246 0.0762 1.4317 0.0303 0.85 138 -0.8568 1.0703 0.0582 0.85 210 -0.9783 1.0975 0.0643 0.85 222 0.4352 1.0098 0.0392 0.85 234 0.5549 0.9965 0.0441