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Nuclear Physics Seminars at BNL

Measurements of X(3872) production in PbPb collisions

by Jing Wang


The structure of the exotic meson X(3872) is still under debate. The similarity of the X(3872) mass and the D-D̄* mass threshold inspired the interpretation that X(3872) is a D-D̄* “molecule” with small binding energy. Another explanation is that this meson is a tetra-quark, consisting of a di-quark and di-antiquark. Relativistic heavy-ion collisions produce an extremely hot and strongly interacting medium, which provides a new environment to study the nature of multi-quark states. Because of the different radii of a D-D̄* “molecule” and a tetra-quark, these two proposed states are expected to interact differently with the medium. Therefore, the yield of X(3872) in heavy-ion collisions can provide insight into its structure. The ratios of production cross-section of fully reconstructed X(3872) over ψ(2S) in PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV with the CMS detector are presented.


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Organized by

Prithwish Tribedy