CERN Accelerating science

Article
Report number	arXiv:2011.11374
Title	Nature of $X(6900)$ and its production mechanism at LHCb
Related title	Nature of X(6900) and its production mechanism at LHCb
Author(s)	Gong, Chang (Beijing, Inst. High Energy Phys. ; TPCSF, Beijing) ; Du, Meng-Chuan (Beijing, Inst. High Energy Phys. ; TPCSF, Beijing ; Beijing, GUCAS) ; Zhao, Qiang (TPCSF, Beijing ; Beijing, GUCAS ; SICQEA, Changsha) ; Zhong, Xian-Hui (Hunan Normal U. ; Hunan, LDQSQC ; SICQEA, Changsha) ; Zhou, Bin (Beijing, Inst. High Energy Phys. ; TPCSF, Beijing)
Publication	2022-01-10
Imprint	2020-11-23
Number of pages	6
Note	6 pages, 3 eps figures; version to appear in Phys. Lett. B
In:	Phys. Lett. B 824 (2022) 136794
DOI	10.1016/j.physletb.2021.136794 (publication)
Subject category	Particle Physics - Phenomenology
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Abstract	We show that the Pomeron exchanges play a unique role in vector charmonium scatterings. Such a mechanism can provide a natural explanation for the nontrivial structures in the di-$J/\psi$ spectrum observed by the LHCb Collaboration. The narrow structure $X(6900)$, as a dynamically generated resonance pole, can arise from the Pomeron exchanges and coupled-channel effects between the $J/\psi$-$J/\psi$, $J/\psi$-$\psi(2S)$ scatterings. A pole structure near the di-$J/\psi$ threshold is also found. Meanwhile, we predict that $X(6900)$ can produce significant threshold enhancement in the $J/\psi$-$\psi(2S)$ energy spectrum which can be searched for at LHCb.
Copyright/License	preprint: (License: CC BY-NC-SA 4.0) publication: © 2021-2024 The Author(s) (License: CC BY 4.0), sponsored by SCOAP³

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