Analysis of the Quantum Numbers JPC of the X(3872) Particle (original) (raw)

We present an analysis of angular distributions and correlations of the X3872 particle in the exclusive decay mode X3872 ! J= ÿ with J= ! ÿ . We use 780 pb ÿ1 of data from p p collisions at s p 1:96 TeV collected with the CDF II detector at the Fermilab Tevatron. We derive constraints on spin, parity, and charge conjugation parity of the X3872 particle by comparing measured angular distributions of the decay products with predictions for different J PC hypotheses. The assignments J PC 1 and 2 ÿ are the only ones consistent with the data.