CLAS physics database search results Measurement E46M153 N/A 0 cos(theta_HS^pi+) dsigma/dcos(theta_HS^pi+) Data errors dimensionless mcb mcb -0.875 0.475565 0.211511 -0.625 0.208906 0.088709 -0.375 0.136365 0.049933 -0.125 0.145357 0.051979