Implications of the Double-Pole Character of theA2Meson

Abstract

We explain the observed double-pole characteristics of the ${A_2}^{-}\mathrm{}\left(1300\right)\mathrm{}$ by a nondiagonalizable degenerate mass matrix for two mesons one of which decays predominantly into $\pi +\rho$. The presence of the other, possibly already observed meson would cause the $A_2$ characteristics to change considerably from one production process to another. From available limited statistics experiments (except for the CERN work discussed here), this appears likely.