We discuss some puzzling aspects of the narrow hidden charm resonance that was recently discovered by the Belle Collaboration at mass 3872 MeV. In order to determine its quantum numbers, a crucial piece of information is the spin of the dipion in the decay final state π+π−J/ψ. We give the angular distributions and correlations of the final particles in the decay which will provide this information about the nature of this resonance.
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Pakvasa et al. (2003) studied this question.
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