CLAS physics database search results Measurement E159M522 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Stat. error deg mcb/rad mcb/rad 30 0.34501 0.0603193 90 0.460056 0.0705569 150 0.48536 0.0719901 210 0.509924 0.0782804 270 0.415236 0.0607027 330 0.3412 0.0589022