A Refined Analysis on the X(3872) Resonance

الأصل · EN

We study the property of the X(3872) meson by analyzing the B→ K D D* and B→ K J/ψπ+π- decay processes. The competition between the rescattering mediated through a Breit-Wigner resonance and the rescattering generated from a local DD* → DD* interaction is carefully studied through an effective lagrangian approach. Three different fits are performed: pure Breit-Wigner case, pure DD* molecule case with only local rescattering vertices (generated by the loop chain), and the mixed case. It is found that data supports the picture where X(3872) is mainly a (cc) Breit-Wigner resonance with a small contribution to the self-energy generated by DD* final state interaction. For our optimal fit, the pole mass and width are found to be: Mₓ=3871.2±0.7MeV and Γₓ=6.5±1.2MeV.