Determination of the sensitivity of $Λ$ and $Λ^+_c$ electric dipole moments using a full angular analysis
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| Format: | Preprint |
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2025
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| author | Ovsiannikov, R. T. Korchin, A. Yu. Kou, E. |
| author_facet | Ovsiannikov, R. T. Korchin, A. Yu. Kou, E. |
| contents | A search for a non-zero Electric Dipole Moment (EDM) of particles, which is a clear signal of a violation of CP symmetry, is one of the unique ways to discover physics beyond the Standard Model. In this paper, we discuss a method for determining the EDM of baryons from the full angular distribution of final particles in electron-positron pair annihilation processes. The question of how accurately the state-of-the-art experiments can determine EDM of $Λ$ and $Λ_c^+$ baryons is discussed in detail. Investigating the pseudo-statistics that corresponds to the BESIII experiment, the estimated sensitivity for $Λ$ EDM is obtained at the level of $10^{-18}$ $e\,$cm. The similar figure for the proposed Super Tau-Charm Facility (STCF) experiment is found to be of the order of $10^{-20}$ $e\,$cm. For the $Λ_c^+$ EDM, the calculated sensitivity for the STCF experiment is $10^{-16}$ $e\,$cm. The case of a polarized initial electron is considered separately as such an option is planned at the STCF experiment. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_19056 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Determination of the sensitivity of $Λ$ and $Λ^+_c$ electric dipole moments using a full angular analysis Ovsiannikov, R. T. Korchin, A. Yu. Kou, E. High Energy Physics - Phenomenology A search for a non-zero Electric Dipole Moment (EDM) of particles, which is a clear signal of a violation of CP symmetry, is one of the unique ways to discover physics beyond the Standard Model. In this paper, we discuss a method for determining the EDM of baryons from the full angular distribution of final particles in electron-positron pair annihilation processes. The question of how accurately the state-of-the-art experiments can determine EDM of $Λ$ and $Λ_c^+$ baryons is discussed in detail. Investigating the pseudo-statistics that corresponds to the BESIII experiment, the estimated sensitivity for $Λ$ EDM is obtained at the level of $10^{-18}$ $e\,$cm. The similar figure for the proposed Super Tau-Charm Facility (STCF) experiment is found to be of the order of $10^{-20}$ $e\,$cm. For the $Λ_c^+$ EDM, the calculated sensitivity for the STCF experiment is $10^{-16}$ $e\,$cm. The case of a polarized initial electron is considered separately as such an option is planned at the STCF experiment. |
| title | Determination of the sensitivity of $Λ$ and $Λ^+_c$ electric dipole moments using a full angular analysis |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2507.19056 |