Journal
PHYSICS LETTERS B
Volume 824, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2021.136794
Keywords
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Funding
- National Natural Science Foundation of China [11425525, 11521505, 11775078, U1832173, 11705056]
- DFG
- NSFC [12070131001, 196253076]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB34030302]
- National Key Basic Research Program of China [2020YFA0406300]
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We find that Pomeron exchanges play a crucial role in vector charmonium scatterings and can provide an explanation for the unique structures observed by the LHCb Collaboration. The presence of a narrow structure X(6900), formed by the exchange of Pomerons and coupled-channel effects, is predicted near the di-J/psi threshold. Furthermore, we predict that X(6900) will result in significant threshold enhancement in the J/psi-psi(2S) energy spectrum, which can be detected at LHCb.
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. (C) 2021 The Author(s). Published by Elsevier B.V.
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