CLAS physics database search results Measurement E151M1918 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 78 0.317 0.7106 0.0356 0.45 18 -0.6252 0.69 0.0483 0.45 78 -0.6499 0.6876 0.0495 0.45 270 -0.1732 0.6681 0.0318 0.45 282 0.4151 0.7193 0.0391 0.55 78 -0.6582 0.6975 0.0499 0.55 126 1.5566 0.5816 0.099 0.55 138 -1.0451 0.6572 0.0701 0.55 222 0.2507 0.7194 0.0336 0.55 270 -0.9138 0.6669 0.063 0.65 138 1.084 0.6812 0.0722 0.65 150 -1.4748 0.6785 0.0943 0.65 198 -0.4209 0.7006 0.0394 0.65 210 -0.081 0.6431 0.0304 0.65 222 -0.459 0.7002 0.0409 0.65 282 0.1373 0.7177 0.0311 0.75 66 -0.5776 0.707 0.0461 0.75 198 -1.1159 0.6516 0.074 0.75 210 -0.9607 0.5955 0.0655 0.75 222 -1.02 0.5793 0.0687 0.75 258 0.3114 0.6624 0.0354 0.75 270 -0.6155 0.5211 0.0479 0.75 282 0.1517 0.686 0.0314 0.85 114 -0.2277 0.7156 0.033 0.85 126 0.0827 0.7281 0.0304 0.85 198 -0.1595 0.7323 0.0315 0.85 210 0.3515 0.6509 0.0368 0.85 222 -0.9375 0.6876 0.0642