CLAS physics database search results Measurement E46M139 N/A 0 cos(theta_HS^pi+) dsigma/dcos(theta_HS^pi+) Data errors dimensionless mcb mcb -0.875 0.506484 0.209655 -0.625 0.192843 0.058945 -0.375 0.220454 0.059552 -0.125 0.152242 0.0437 0.125 0.183785 0.052855 0.375 0.201059 0.057855 0.625 0.127958 0.041039