A broad peak is observed at low K+K- invariant mass in J/ψ → K+K-π0 decays found in a sample of 5.8 × 107 J/ψ events collected with the BESII detector. The statistical significance of the broad resonance is much larger than 5. A partial wave analysis shows that the JPC of this structure is 1 - . Its pole position is determined to be [1576-55+49(stat)-91+98(syst)] MeV/c2-i2[818-23+22(stat)-133+64(syst)]MeV/c2. These parameters are not compatible with any kno...
