Constraints from precision measurements on the hadron-molecule interpretation of X,Y,Z resonances

Abstract

The precise measurement of binding energy, total width and DDpi branching fraction, constrains, in a model independent way, the loosely bound hadron molecule interpretation of X(3872). A full discernment is not yet possible on the basis of present data. Similar considerations might be extended to all those Y,Z resonances susceptible of a molecular description.Comment: 6 pages, 1 figur