Experimental constraints on the possible JPC quantum numbers of the X(3872)
K. Abe
Abstract
We examine possible JPC quantum number assignments for the X(3872). Angular correlations between final state particles in X(3872) --> pi+pi- J/psi decays are used to rule out JPC values of 0++ and 0-+. The shape of the pi+pi- mass distribution near its upper kinematic limit favors S-wave over P-wave as the relative orbital angular momentum between the final-state dipion and J/psi, which strongly disfavors 1-+ and 2-+ assignments. The accumulated evidence strongly favors a JPC = 1++ assignment for the X(3872), although the 2++ possibility is not ruled out by tests reported here. The analysis is based on a sample of X(3872) mesons produced via the exclusive process B --> K X(3872) in a 256 fb-1 data sample collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider.
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