CP violation in η (′) → π + π − μ + μ − decays
Abstract It has been pointed out recently that a certain set of dimension-6 scalar P- and CP-violating light-quark-muon operators may be tested in η and η′ decays to various final states involving μ + μ − pairs, at a level not yet excluded by constraints from electric dipole moments. We here work ou...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-12-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP12(2022)001 |
| _version_ | 1797860070732595200 |
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| author | Maximilian Zillinger Bastian Kubis Pablo Sánchez-Puertas |
| author_facet | Maximilian Zillinger Bastian Kubis Pablo Sánchez-Puertas |
| author_sort | Maximilian Zillinger |
| collection | DOAJ |
| description | Abstract It has been pointed out recently that a certain set of dimension-6 scalar P- and CP-violating light-quark-muon operators may be tested in η and η′ decays to various final states involving μ + μ − pairs, at a level not yet excluded by constraints from electric dipole moments. We here work out the hadronic matrix elements required for the predictions for the decays η, η′ → π + π − μ + μ − . We relate a new asymmetry in the angular distribution between the dipion and dimuon decay planes to the corresponding Wilson coefficients. Despite the advantage of not requiring the measurement of muon polarization, the projected sensitivities are shown to be moderate due to a combination of small phase space and chiral suppression. Such sensitivity studies are most timely in view of upcoming or planned high-statistics η (′) experiments such as the JLab eta factory or REDTOP. |
| first_indexed | 2024-04-09T21:39:49Z |
| format | Article |
| id | doaj.art-28e0a0ba370643c8a259cb5b922fde6a |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-04-09T21:39:49Z |
| publishDate | 2022-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-28e0a0ba370643c8a259cb5b922fde6a2023-03-26T11:04:22ZengSpringerOpenJournal of High Energy Physics1029-84792022-12-0120221212310.1007/JHEP12(2022)001CP violation in η (′) → π + π − μ + μ − decaysMaximilian Zillinger0Bastian Kubis1Pablo Sánchez-Puertas2Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität BonnHelmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität BonnInstitut de Física d’Altes Energies (IFAE) and Barcelona Institute of Science and Technology (BIST)Abstract It has been pointed out recently that a certain set of dimension-6 scalar P- and CP-violating light-quark-muon operators may be tested in η and η′ decays to various final states involving μ + μ − pairs, at a level not yet excluded by constraints from electric dipole moments. We here work out the hadronic matrix elements required for the predictions for the decays η, η′ → π + π − μ + μ − . We relate a new asymmetry in the angular distribution between the dipion and dimuon decay planes to the corresponding Wilson coefficients. Despite the advantage of not requiring the measurement of muon polarization, the projected sensitivities are shown to be moderate due to a combination of small phase space and chiral suppression. Such sensitivity studies are most timely in view of upcoming or planned high-statistics η (′) experiments such as the JLab eta factory or REDTOP.https://doi.org/10.1007/JHEP12(2022)001Chiral LagrangianCP ViolationEffective Field Theories of QCDSMEFT |
| spellingShingle | Maximilian Zillinger Bastian Kubis Pablo Sánchez-Puertas CP violation in η (′) → π + π − μ + μ − decays Journal of High Energy Physics Chiral Lagrangian CP Violation Effective Field Theories of QCD SMEFT |
| title | CP violation in η (′) → π + π − μ + μ − decays |
| title_full | CP violation in η (′) → π + π − μ + μ − decays |
| title_fullStr | CP violation in η (′) → π + π − μ + μ − decays |
| title_full_unstemmed | CP violation in η (′) → π + π − μ + μ − decays |
| title_short | CP violation in η (′) → π + π − μ + μ − decays |
| title_sort | cp violation in η π π μ μ decays |
| topic | Chiral Lagrangian CP Violation Effective Field Theories of QCD SMEFT |
| url | https://doi.org/10.1007/JHEP12(2022)001 |
| work_keys_str_mv | AT maximilianzillinger cpviolationinēppmmdecays AT bastiankubis cpviolationinēppmmdecays AT pablosanchezpuertas cpviolationinēppmmdecays |