Probing Quantum Entanglement in $τ^+τ^-$ Pairs via the $ππ$ Channel at STCF
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866918477940391936 |
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| author | Li, Xiaokang Bao, Chentao Chen, Hai Liu, Mingyi Wang, Dayong |
| author_facet | Li, Xiaokang Bao, Chentao Chen, Hai Liu, Mingyi Wang, Dayong |
| contents | Quantum entanglement and Bell-inequality violation in $τ^+τ^-$ pairs provide a sensitive probe of quantum correlations in high-energy interactions. We present a feasibility study of $e^+e^- \to τ^+τ^-$ at the proposed Super Tau-Charm Facility based on full Monte Carlo simulation at $\sqrt{s} = 7$ GeV, focusing on the $ππ$ channel ($τ^\pm \to π^\pmν$), which offers the maximal spin-analyzing power $|κ| = 1$ and the simplest final-state topology for validating the quantum-tomography framework. We establish a consistency chain from the tree-level QED prediction through truth-level and detector-level reconstruction, yielding a reconstructed concurrence of $0.279 \pm 0.007$ with the good-solution approach. A complementary full-simulation study of the $ρρ$ channel is also briefly reported. These results demonstrate that the STCF can provide a competitive platform for precision studies of quantum correlations in $τ$-lepton pairs. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_01233 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Probing Quantum Entanglement in $τ^+τ^-$ Pairs via the $ππ$ Channel at STCF Li, Xiaokang Bao, Chentao Chen, Hai Liu, Mingyi Wang, Dayong High Energy Physics - Experiment High Energy Physics - Phenomenology Quantum Physics Quantum entanglement and Bell-inequality violation in $τ^+τ^-$ pairs provide a sensitive probe of quantum correlations in high-energy interactions. We present a feasibility study of $e^+e^- \to τ^+τ^-$ at the proposed Super Tau-Charm Facility based on full Monte Carlo simulation at $\sqrt{s} = 7$ GeV, focusing on the $ππ$ channel ($τ^\pm \to π^\pmν$), which offers the maximal spin-analyzing power $|κ| = 1$ and the simplest final-state topology for validating the quantum-tomography framework. We establish a consistency chain from the tree-level QED prediction through truth-level and detector-level reconstruction, yielding a reconstructed concurrence of $0.279 \pm 0.007$ with the good-solution approach. A complementary full-simulation study of the $ρρ$ channel is also briefly reported. These results demonstrate that the STCF can provide a competitive platform for precision studies of quantum correlations in $τ$-lepton pairs. |
| title | Probing Quantum Entanglement in $τ^+τ^-$ Pairs via the $ππ$ Channel at STCF |
| topic | High Energy Physics - Experiment High Energy Physics - Phenomenology Quantum Physics |
| url | https://arxiv.org/abs/2605.01233 |