Spin polarization and quantum entanglement of baryon-antibaryon pairs produced in electron-positron annihilation
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866910070895280128 |
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| author | Chen, Cheng Xie, Ju-Jun |
| author_facet | Chen, Cheng Xie, Ju-Jun |
| contents | In this work, we systematically investigate the evolution of spin polarization and quantum entanglement in cascade decays of baryon-antibaryon pairs, which are produced in electron-positron annihilation. We derive a fully analytical spin density matrix explicitly expressed in terms of spin polarization observables, extend this formalism to multi-step cascade decay scenarios, and establish compact recursive relations to facilitate density matrix calculations for such processes. It is found that when maximal parity violation occurs during a decay, the resulting final-state particles are fully polarized and exist in a non-entangled state. Furthermore, we demonstrate that quantum entanglement amplification is a generic characteristic of charge-conjugate decays under $CP$ conservation when the initially produced baryon-antibaryon pair is polarized. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_24011 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spin polarization and quantum entanglement of baryon-antibaryon pairs produced in electron-positron annihilation Chen, Cheng Xie, Ju-Jun High Energy Physics - Phenomenology In this work, we systematically investigate the evolution of spin polarization and quantum entanglement in cascade decays of baryon-antibaryon pairs, which are produced in electron-positron annihilation. We derive a fully analytical spin density matrix explicitly expressed in terms of spin polarization observables, extend this formalism to multi-step cascade decay scenarios, and establish compact recursive relations to facilitate density matrix calculations for such processes. It is found that when maximal parity violation occurs during a decay, the resulting final-state particles are fully polarized and exist in a non-entangled state. Furthermore, we demonstrate that quantum entanglement amplification is a generic characteristic of charge-conjugate decays under $CP$ conservation when the initially produced baryon-antibaryon pair is polarized. |
| title | Spin polarization and quantum entanglement of baryon-antibaryon pairs produced in electron-positron annihilation |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2603.24011 |