CLAS physics database search results Measurement E151M1623 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 234 -1.4104 0.9929 0.0873 0.65 222 -2.1681 2.1681 0.1296 0.65 234 1.9467 0.5011 0.1171 0.65 246 -1.8829 0.5263 0.1135 0.75 222 -0.4212 1.1156 0.0387 0.75 258 0.8725 0.9893 0.0589 0.85 222 -0.4139 1.0558 0.0385 0.85 246 -0.3855 0.9363 0.0374 0.85 258 0.1639 0.9711 0.0315 0.85 270 1.1415 0.8715 0.0728 0.95 246 -0.4439 0.8875 0.0396 0.95 270 0.4359 0.857 0.0393 0.55 246 0.1819 0.8577 0.0319 0.65 126 0.5626 0.8713 0.0451 0.65 222 1.0352 0.7533 0.0689 0.65 234 -1.0426 0.7458 0.0693 0.75 234 -0.7619 0.7176 0.0546 0.75 246 -0.8226 0.8773 0.0577 0.75 258 -0.5989 0.7655 0.0468 0.85 234 -0.2042 0.798 0.0324 0.85 246 1.209 0.6589 0.0784 0.85 258 -0.8259 0.7192 0.0579