A search is reported for structures near the J/ψ J/ψ mass threshold using a dataset of proton-proton collisions at √s \: =13 \: TeV recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of about 135 \: fb⁻¹. Two structures are observed with a significance exceeding 5σ and evidence of an additional structure is reported with a local significance of 4.7σ.
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Wang et al. (2024) studied this question.
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