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Study of the Decay {ital {tau}}{sup {minus}}{r_arrow}2{ital {pi} }{sup {minus}}{ital {pi}}{sup +} 3{ital {pi}}{sup 0}{ital {nu}}{sub {ital {tau} }}
The decay {tau}{sup {minus}}{r_arrow}2{pi}{sup {minus}}{pi}{sup + }3{pi}{sup 0}{nu}{sub {tau}} has been studied with the CLEOII detector at the Cornell Electron Storage Ring. The branching fraction is measured to be (2.85{plus_minus}0.56{plus_minus}0.51){times}10{sup {minus}4} . The result is in good agreement with the isospin expectation but somewhat below the conserved-vector-current prediction. We have …