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At the COMPASS experiment a sample of ∼380000 exclusive events of diffractive pion dissociation on a lead target into a π−π+π−π+π− final state has been recorded in 2004. The 5π invariant mass spectrum shows a momentum transfer dependent structure peaking around 1.8 GeV/c2. In the (4π)0 subsystem there is a clear signal for the f1(1285) resonance decaying into 4 pions. In this note we describe the data sample and explore the physics potential of this final state.

Diffractive Pion Dissociation into π[sup −]π[sup +]π[sup −]π[sup +]π[sup −] at COMPASS