## A Study of e+ e- -> pi+ pi- pi0 pi0 at 3.090 GeV Center of Mass Energy

The process {epsilon}{sup +}{epsilon}{sup -} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup 0}{pi}{sup 0} is studied at a center of mass energy of 3.090 GeV, the J/{psi} center of mass energy, by the Mark III detector at SPEAR. The branching ratios for {psi} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup 0}{pi}{sup 0} and several background processes are measured: {psi} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup 0}{pi}{sup 0}{pi}{sup 0}, {psi} {yields} K{sup {+-}}K{sup {-+}}{pi}{sup 0}{pi}{sup 0}, and {phi} K{sup {+-}}{pi}{sup {-+}}{pi}{sup 0}{pi}{sup 0}. Upper limits on e{sup +}e{sup -} {yields} {rho}{sup +}{rho}{sup -} are derived. Evidence is presented that the isobar model of low-energy hadronic interactions may not applymore »