Observation of a broad 1-- resonant structure around 1.5 GeV/c2 in the K+K- mass spectrum in J/psi --> K+K-pi0
Abstract
A broad peak is observed at low K+K- invariant mass in J/psi --> K+K-pi0 decays found in a sample of 5.8× 107 J/psi events collected with the BESII detector. A partial wave analysis shows that the JPC of this structure is 1--. Its pole position is determined to be (1576+49-55(stat)+98-91(syst)) MeV/c2 - i(409+11-12$(stat)+32-67(syst)) MeV/c2. These parameters are not compatible with any known meson resonances.
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