CLAS physics database search results Measurement E151M2409 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.65 54 -2.8823 2.8823 0.2111 0.65 282 -0.4249 0.9712 0.043 0.75 102 1.8603 0.8118 0.1382 0.75 198 -0.4937 0.9442 0.0467 0.75 210 -0.7448 0.9785 0.0618 0.75 258 -0.9768 1.0166 0.0769 0.75 282 -0.0925 1.0056 0.0307 0.85 90 -0.2968 1.057 0.0369 0.85 102 0.0309 0.8617 0.0301 0.85 114 -0.095 0.9288 0.0308 0.85 126 0.339 1.1574 0.0388 0.85 186 0.0669 0.7883 0.0304 0.85 198 0.2086 0.8414 0.0336 0.85 210 -0.074 0.8402 0.0305 0.85 222 -0.3391 0.8924 0.0388 0.85 234 0.6704 1.0467 0.0571 0.95 210 -2.1452 0.8083 0.1584