CLAS physics database search results Measurement E159M892 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Stat. error deg mcb/rad mcb/rad 30 0.0513635 0.0116822 90 0.0689624 0.0170532 150 0.107805 0.0219536 210 0.0967741 0.0186369 270 0.0689282 0.0153572 330 0.064786 0.0141118