Speaker
Eric Braaten
(Ohio State University)
Description
In most recent analyses of D^0 D-bar^0 pi^0 decays of the X(3872), these events were assumed to come from D^{*0} D-bar^0 or D^0 D-bar^{*0} followed by the decay of the D^{*0} or D-bar^{*0}. Given this assumption, every D^0 D-bar^0 pi^0 event near the D^{*0} D-bar^0 threshold is assigned an invariant mass above the threshold. Such an analysis necessarily yields a mass for the X(3872) that is above the D^{*0} D-bar^0 threshold. We carry out an analysis of the recent D^0 D-bar^0 pi^0 data from the Babar and Belle Collaborations that takes into account this effect as well as the universal features of an S-wave threshold resonance. Our best fits give a mass for the X(3872) that is below the D^{*0} D-bar^0 threshold and consistent with the mass obtained from analyses of the J/psi pi^+ pi^- decay channel. Our analysis demonstrates that the same narrow resonance below the D^{*0} D-bar^0 threshold is responsible for the J/psi pi^+ pi^- and D^0 D-bar^0 pi^0 events. It reinforces the identification of the X(3872) as an extremely weakly-bound charm meson molecule.
Author
Eric Braaten
(Ohio State University)
Co-author
James Stapleton
(Ohio State University)
