Abstract
The observation of the unexpected XYZP resonances has challenged the usual heavy quarkonium framework. One of the most studied exotic states, the X(3872), happens to be copiously produced in high-energy hadron collisions. We discuss how this large prompt production cross-section, together with the comparison with light nuclei production data, disfavors a loosely-bound molecule interpretation, and calls for a new interpretation for the exotic hadron resonances. We also present the research of the Joint Physics Analysis Center in Hadron Spectroscopy.
Highlights
The last decade witnessed the observation of many unexpected XY ZP resonances in the heavy quarkonium sector
Refs. [18, 19] proposed a more mechanistic way to take into account final state interactions: it was considered that some of the large number of pions produced might elastically interact with the would-be-molecule constituents, changing the relative momentum in the center of mass of the pair. If this interaction reduces the relative momentum of even a small part of the many large-k0 pairs, there could be a significant effect of feed-down of pairs towards lower bins, even in the very low energy region below 50 MeV
One might assume the very opposite point of view, i.e. that at high pT the production is dominated by the short-range nature of the state, and expect the slope of the differential cross section to depend on the quark counting only
Summary
The last decade witnessed the observation of many unexpected XY ZP resonances in the heavy quarkonium sector. If this interaction reduces the relative momentum of even a small part of the many large-k0 pairs, there could be a significant effect of feed-down of pairs towards lower bins, even in the very low energy region below 50 MeV.
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