Spin correlations and quantum entanglement in γγ→ tt̅ at polarized photon colliders with NLO QCD corrections

@misc{jiang2026spin,
  title = {{Spin correlations and quantum entanglement in $γγ\to t\bar t$ at polarized photon colliders with NLO QCD corrections}},
  author = {Jun Jiang and Zong-Guo Si and Han Zhang and Xin-Yi Zhang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2606.21152},
  eprint = {2606.21152},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.21152},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Spin correlations and quantum entanglement in γγ→ tt̅ at polarized photon colliders with NLO QCD corrections
AU  - Jun Jiang
AU  - Zong-Guo Si
AU  - Han Zhang
AU  - Xin-Yi Zhang
PY  - 2026
DA  - 2026/10/30
PB  - arXiv
DO  - 10.48550/arxiv.2606.21152
UR  - https://arxiv.org/abs/2606.21152
AB  - We study spin correlations and quantum entanglement in the process γγ→ tt̅ with the photons coming from Compton backscattered laser beam. We present predictions for the cross sections and spin observables including next-to-leading order (NLO) QCD corrections under various beam-polarization configurations. The NLO QCD corrections significantly enhance the total cross section while having only a minor impact on spin observables. Using the spin density matrix of the tt̅ system, we further investigate quantum entanglement and Bell nonlocality. We find that the entanglement is the strongest near the tt̅ invariant-mass threshold, while both entanglement and Bell nonlocality are highly sensitive to the initial beam polarization. Our results provide a theoretical basis for future studies of quantum correlations in top-quark pair production at photon colliders.
ER  -