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arXiv · 2207.04893

Improved understanding of the peaking phenomenon existing in the new di-$J/ψ$ invariant mass spectrum from the CMS Collaboration

Jun-Zhang Wang·Xiang Liu
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Abstract

Very recently, the CMS Collaboration reported a peaking phenomenon existing in the di-$J/ψ$ invariant mass spectrum from $pp$ collision, by which the $X(6900)$ structure announced by the LHCb Collaboration was confirmed, but also more enhancement structures were discovered. Facing such a novel phenomenon, in this work we indicate that these new features reflected from the CMS measurement provide a good implication for a dynamical mechanism which reproduces the novel peaking phenomenon in the reported $J/ψ$-pair mass spectrum well. This mechanism is due to special reactions, where different charmonium pairs directly produced by $pp$ collision may transit into the final state of $J/ψJ/ψ$. The present work provides a special viewpoint to decode these observed fully charm structures in the $J/ψ$-pair invariant mass spectrum.

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Jun-Zhang Wang, Xiang Liu. 2022-09-14. Improved understanding of the peaking phenomenon existing in the new di-$J/ψ$ invariant mass spectrum from the CMS Collaboration. https://doi.org/10.1103/physrevd.106.054015

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