CLAS physics database search results Measurement E151M3246 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LU Stat. error Syst. error degrees 0.75 150 0.3308 0.2464 0.0307 0.75 234 -0.7101 0.1913 0.0332 0.85 222 0.0488 0.2485 0.03 0.85 246 -0.0716 0.2418 0.03 0.65 234 -0.4029 0.2363 0.0311