Measurement of J/ψ-jet correlations in pp and Pb+Pb collisions at √(s_NN)=5.02 TeV with the ATLAS detector

@misc{collaboration2026measurement,
  title = {{Measurement of $J/ψ$-jet correlations in $pp$ and Pb+Pb collisions at $\sqrts_\textNN=5.02$ TeV with the ATLAS detector}},
  author = {ATLAS Collaboration},
  howpublished = {arXiv},
  year = {2026},
  month = jun,
  doi = {10.48550/arxiv.2606.31375},
  eprint = {2606.31375},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.31375},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Measurement of J/ψ-jet correlations in pp and Pb+Pb collisions at √(s_NN)=5.02 TeV with the ATLAS detector
AU  - ATLAS Collaboration
PY  - 2026
DA  - 2026/06/30
PB  - arXiv
DO  - 10.48550/arxiv.2606.31375
UR  - https://arxiv.org/abs/2606.31375
AB  - Yields of charmonia, bound states of cc̅ quarks, are observed to be strongly suppressed in heavy-ion collisions relative to proton-proton collisions as a result of their interaction with the quark-gluon plasma produced in such collisions. Understanding the mechanisms responsible for this suppression requires a detailed understanding of charmonium production. To constrain the production mechanisms, it is essential to quantify how charmonium production correlates with jet activity. Measurements of J/ψ production in the dimuon decay channel are presented for inclusive J/ψ mesons and for J/ψ mesons that are either isolated or not isolated from jets, separately for prompt and non-prompt production. Non-isolated J/ψ mesons are defined by matching J/ψ candidates to anti-k_t jets with R=0.2 and p_T>20 GeV, reconstructed without signal from the J/ψ meson, allowing the quantification of jet activity accompanying J/ψ production. The analysis uses Pb+Pb and pp collisions at √(s_NN)=5.02 TeV recorded by the ATLAS experiment at the LHC, corresponding to integrated luminosities of 1.82 nb^−1 and 0.26 fb^−1, respectively. The J/ψ yields in Pb+Pb, cross sections in pp, and nuclear modification factors are presented for non-isolated, isolated, and inclusive J/ψ up to p_T=60 GeV. Isolated fractions and non-prompt fractions are reported in both pp and Pb+Pb collisions. Strong J/ψ suppression is observed to persist up to the highest measured p_T values, with differences observed between non-isolated, isolated, and inclusive J/ψ. These results provide new constraints on charmonium production mechanisms and their in-medium suppression.
ER  -