CLAS physics database search results Measurement E159M405 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.768935 0.113047 90 0.780616 0.119009 150 0.986193 0.143094 210 0.912119 0.128813 270 0.797198 0.114343 330 0.720674 0.101696