CLAS physics database search results Measurement E159M558 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Stat. error deg mcb/rad mcb/rad 30 0.753921 0.109517 90 0.840159 0.126768 150 0.845051 0.120058 210 0.76585 0.114755 270 0.662173 0.0974711 330 0.742594 0.115783