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The discovery of pentaquark baryons has attracted new attention to the search for the sixquark (hexaquark) object. Since the observation of double- hypernuclei, the hypothesized Hdibaryon can no longer exist below the  mass by more than a few MeV. Enhanced  production near threshold, which has been recon rmed by two other experiments, was rst observed in 12C(K;K+)X reactions at KEK-PS and re ects the possible existence of a  resonance, which is referred to as an H-dibaryon resonance state. The present study of  enhancement near threshold has been performed to study the spin of the parent particle decaying into . It should be noted that the  resonance(s) below 2.261 GeV/c2 is likely to be a spin 0 state.


The discovery of pentaquark baryons has attracted new attention to the search for the sixquark (hexaquark) object. Since the observation of double- hypernuclei, the hypothesized Hdibaryon can no longer exist below the  mass by more than a few MeV. Enhanced  production near threshold, which has been recon rmed by two other experiments, was rst observed in 12C(K;K+)X reactions at KEK-PS and re ects the possible existence of a  resonance, which is referred to as an H-dibaryon resonance state. The present study of  enhancement near threshold has been performed to study the spin of the parent particle decaying into . It should be noted that the  resonance(s) below 2.261 GeV/c2 is likely to be a spin 0 state.