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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.22087 |
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| _version_ | 1866917247406047232 |
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| author | Chen, Kai-Bao He, Xiao-Gang Ma, Jian-Ping Tong, Xuan-Bo |
| author_facet | Chen, Kai-Bao He, Xiao-Gang Ma, Jian-Ping Tong, Xuan-Bo |
| contents | Electric dipole moment (EDM) of baryons provides a sensitive probe of CP-violating interactions beyond the Standard Model. Motivated by the recent BESIII measurement on the $Λ$-hyperon EDM [1], we present the first perturbative QCD analysis of the $Λ$ EDM form factor to elucidate its origin in CP-violating quark dipole interactions. In particular, we derive a QCD factorization formula that relates the $Λ$ EDM form factor to quark EDMs and chromo-electric dipole moments (CEDMs) through convolutions with the light-cone distribution amplitudes of $Λ$. These connections allow us to extract constraints on CP-violating dipole couplings from current and future hyperon EDM measurements. Our numerical analysis demonstrates that the $Λ$ EDM exhibits unique sensitivity to the strange-quark CEDM, providing complementary information to that obtained from the neutron EDM. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_22087 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Perturbative QCD Prediction of the Hyperon EDM from CP-violating Dipole Interactions Chen, Kai-Bao He, Xiao-Gang Ma, Jian-Ping Tong, Xuan-Bo High Energy Physics - Phenomenology Electric dipole moment (EDM) of baryons provides a sensitive probe of CP-violating interactions beyond the Standard Model. Motivated by the recent BESIII measurement on the $Λ$-hyperon EDM [1], we present the first perturbative QCD analysis of the $Λ$ EDM form factor to elucidate its origin in CP-violating quark dipole interactions. In particular, we derive a QCD factorization formula that relates the $Λ$ EDM form factor to quark EDMs and chromo-electric dipole moments (CEDMs) through convolutions with the light-cone distribution amplitudes of $Λ$. These connections allow us to extract constraints on CP-violating dipole couplings from current and future hyperon EDM measurements. Our numerical analysis demonstrates that the $Λ$ EDM exhibits unique sensitivity to the strange-quark CEDM, providing complementary information to that obtained from the neutron EDM. |
| title | Perturbative QCD Prediction of the Hyperon EDM from CP-violating Dipole Interactions |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2509.22087 |