Belle data for the pipi mass spectrum in X(3872)-->pi(+)pi(-)J/Psi are well fitted by rho+J/Psi with J(PC)=1(++), but are poorly fitted by the pipi S-wave. This rules out quantum numbers 1(+-), 2(--) and 3(--). Formulas for partial wave amplitudes are given for all likely J(PC) and decay modes of the 3941 MeV peak which Belle observe in omega+J/Psi. Angular correlations involving up to five angles may allow a spin-parity determination, even with quite low statistics. Special attention is given to the case where X(3872) is a cusp or quasi-bound state with the same quantum numbers as the 3941 MeV peak.
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K-+/-pi(+)pi(-)J/psi decays RID F-6576-2010 RID F-3854-2010 RID C-7266-2011" ref-id="1000007913256099" ref-i-id="">Observation of a narrow charmoniumlike state in exclusive B-+/--> K-+/-pi(+)pi(-)J/psi decays RID F-6576-2010 RID F-3854-2010 RID C-7266-2011[J].
PHYSICAL REVIEW LETTERS,2003