Refined analysis on the X(3872) resonance

We study the property of the X(3872) meson by analyzing the B -> KD (D) over bar* and B -> KJ/psi pi(+)pi(-) decay processes. The competition between the rescattering mediated through a Breit-Wigner resonance and the rescattering generated from a local D (D) over bar* -> D (D) over bar* interaction is carefully studied through an effective Lagrangian approach. Three different fits are performed: pure Breit-Wigner case, pure D (D) over bar* 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 ((c) over barc) Breit-Wigner resonance with a small contribution to the self-energy generated by (D) over barD* final state interaction. For our optimal fit, the pole mass and width are found to be: M-X = 3871.2 +/- 0.7 MeV and Gamma(X) = 6.5 +/- 1.2 MeV.