Speaker
Description
The speaker will discuss the new structures reported by the CMS collaboration recently. Three structures are found in the J/ψJ/ψ mass spectrum in pp collisions at 13 TeV, and a model with quantum interference among these structures provides a good description of the data. Among them, a new structure with mass around 6.6 GeV is observed with a local significance > 5σ. Another structure with even higher significance is consistent with the X(6900) resonance reported by LHCb and confirmed by ATLAS. Evidence for another new structure, with a local significance of 4.7σ, is found at a mass around 7.1 GeV. Results are also reported for a model without interference, which does not fit the data as well and shows mass shifts relative to the model with interference.
