Study $γγ\to τ^+τ^-$ process including $τ^+ τ^-$ spin information in Pb-Pb ultraperipheral collision and at Lepton collider

Peng-Cheng Lu; Zong-Guo Si; Han Zhang; Xin-Yi Zhang

doi:10.1103/2g5j-k778

paper

Study $γ γ \to τ^{+} τ^{-}$ process including $τ^{+} τ^{-}$ spin information in Pb-Pb ultraperipheral collision and at Lepton collider

arXiv:2511.18935 · doi:10.1103/2g5j-k778

Abstract

We study the $γ γ \to τ^{+} τ^{-}$ process including full $τ^{+} τ^{-}$ spin information in Pb--Pb ultraperipheral collision and at lepton colliders. We present the predictions for the corresponding cross sections and spin correlations at NLO electroweak precision, and find that the NLO electroweak contributions are numerically small for the observables considered. Additionally, we use the spin correlations obtained in this paper to analyze the quantum entanglement in the $τ^{+} τ^{-}$ system of the $γ γ \to τ^{+} τ^{-}$ process. Our results show that there is a genuine entangled configuration near the $τ^{+} τ^{-}$ invariant mass threshold. This work is helpful for studying the $τ$ -pair production induced by photon-photon collision at high energy colliders.

arXiv comment15 pages, 3 figures, accepted for publication in PRD

Study γγ→τ+τ− process including τ+τ− spin information in Pb-Pb ultraperipheral collision and at Lepton collider

Abstract

References in corpus (31)

Study $γ γ \to τ^{+} τ^{-}$ process including $τ^{+} τ^{-}$ spin information in Pb-Pb ultraperipheral collision and at Lepton collider