CLAS physics database search results Measurement E159M36 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.457874 0.0667747 90 0.573058 0.0771534 150 0.655757 0.0875326 210 0.628908 0.0848262 270 0.609533 0.0823851 330 0.423489 0.0608537