CLAS physics database search results Measurement E151M1401 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 42 0.5997 0.8974 0.074 0.55 258 -1.1855 0.715 0.137 0.65 234 -0.5806 0.8584 0.072 0.65 258 -0.1891 0.7324 0.0368 0.75 246 1.3192 0.7133 0.1518 0.75 258 -0.3879 0.7681 0.053 0.85 234 0.0989 0.8374 0.032 0.85 258 0.683 0.7836 0.0827