CLAS physics database search results Measurement E159M532 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Stat. error deg mcb/rad mcb/rad 30 0.442058 0.0641606 90 0.552476 0.0810132 150 0.620012 0.0862488 210 0.605421 0.0876677 270 0.434909 0.0649875 330 0.390044 0.0577384