CLAS physics database search results Measurement E46M144 N/A 0 cos(theta_HS^pi+) dsigma/dcos(theta_HS^pi+) Data errors dimensionless mcb mcb -0.875 0.41195 0.174574 -0.625 0.143279 0.065811 -0.375 0.13221 0.038718 -0.125 0.159301 0.067977 0.125 0.153181 0.047934 0.375 0.133584 0.045655