Evidence for the Radial-Excited State of pi ' Pion and Axial-Vector A1-Resonance Coherently Produced on Nuclei by pi-Mesons at 40 GeV/C

摘要

Results of the partial wave analysis of 3 pi -system coherently produced on nuclei at 40 GeV/c have been used for determining stable poles in the lower half of the complex energy plane using Pade approximation method for partial amplitudes. The stable poles in waves 1 exp + S, 0 exp - S determine the position and width of axial-vector Al resonance Msub(Al)=(1255+-23) MeV, GITAsub(Al)=(292+-40) MeV and radial-excited state of pi ' pion Msub( pi ')=(1208+-21) MeV, GITAsub( pi ')=(336+-46) MeV. (Atomindex citation 14:760052)