PreprintCC BY-NC-SA 4.0arXiv
When hadrons collide: di-J/psi structure in the final state
Abstract
The structures in the di-J/psi spectrum seen at the LHC are widely read as fully charmed tetraquarks. As an alternative scenario, the 2++ production amplitude for a compact ccc̅c̅ source rescattering through ten charmonium-pair channels is presented. The model is completely fixed except for three background parameters and provides a competitive description of the data, with chi-sq/ndf=56/50. Prominent features are driven by J/psi psi(nS) thresholds or threshold enhancement, with no need for exotic hadrons.
Related
- Final-state effects on the transverse-momentum spectra of charged hadrons in p+Pb and Pb+Pb collisions at √(sNN) = 5.02~TeV using the modified Tsallis distribution
- The ψ(2S) state as a subthreshold pole in electron positron annihilation into DD̅ final states
- Logarithmically-accurate final-state showers with massive quarks
- The decay ηc→ pp̅η with meson--baryon final-state interactions
- Discriminating baryonium and final-state-interaction interpretations of X(2356)
BibTeX
@misc{swanson2026when,
title = {{When hadrons collide: di-J/psi structure in the final state}},
author = {Eric S. Swanson},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.15248},
eprint = {2610.15248},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.15248},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - When hadrons collide: di-J/psi structure in the final state
AU - Eric S. Swanson
PY - 2026
DA - 2026/10/11
PB - arXiv
DO - 10.48550/arxiv.2610.15248
UR - https://arxiv.org/abs/2610.15248
AB - The structures in the di-J/psi spectrum seen at the LHC are widely read as fully charmed tetraquarks. As an alternative scenario, the 2^++ production amplitude for a compact ccc̅c̅ source rescattering through ten charmonium-pair channels is presented. The model is completely fixed except for three background parameters and provides a competitive description of the data, with chi-sq/ndf=56/50. Prominent features are driven by J/psi psi(nS) thresholds or threshold enhancement, with no need for exotic hadrons.
ER -