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

TL;DR

This paper investigates the peaking phenomena in the di-$J/mbda$ invariant mass spectrum observed by CMS, proposing a dynamical mechanism involving charmonium pair transitions to explain the newly observed structures.

Contribution

It introduces a novel dynamical mechanism that reproduces the peaking phenomena in the $J/mbda$-pair mass spectrum, offering a new perspective on fully charm structures.

Findings

The mechanism successfully reproduces the peaking features in the CMS data.

New enhancement structures in the $J/mbda$-pair spectrum are explained by charmonium transitions.

Provides a new interpretation for the observed fully charm structures.

Abstract

Very recently, the CMS Collaboration reported a peaking phenomenon existing in the di-$J/\psi$ 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 $J/\psi$-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 $J/\psi J/\psi$. The present work provides a special viewpoint to decode these observed fully charm structures in the $J/\psi$-pair invariant mass spectrum.