Light dilaton in rare meson decays and extraction of its CP property
Abstract The dilaton ϕ is a pseudo-Nambu-Goldstone boson associated with the spontaneous breaking of scale invariance in a nearly conformal theory, and couples to the trace of the stress-energy tensor. We analyze experimental constraints on a light dilaton with mass in the MeV–GeV range from rare me...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-01-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP01(2024)153 |
| _version_ | 1797341354712367104 |
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| author | Sudhakantha Girmohanta Yuichiro Nakai Yoshihiro Shigekami Kohsaku Tobioka |
| author_facet | Sudhakantha Girmohanta Yuichiro Nakai Yoshihiro Shigekami Kohsaku Tobioka |
| author_sort | Sudhakantha Girmohanta |
| collection | DOAJ |
| description | Abstract The dilaton ϕ is a pseudo-Nambu-Goldstone boson associated with the spontaneous breaking of scale invariance in a nearly conformal theory, and couples to the trace of the stress-energy tensor. We analyze experimental constraints on a light dilaton with mass in the MeV–GeV range from rare meson decays. New model-independent inclusive bounds for the b → sϕ transition largely exclude the parameter space of a light dilaton that could explain the muon g − 2 anomaly. Despite similarities between a dilaton and a Higgs-portal scalar, the dilaton-photon coupling is enhanced compared to the Higgs-portal scalar due to contributions from loops of the conformal sector. Consequently, the shortened lifetime of the dilaton relaxes bounds from K → π + invisible searches at the NA62 experiment and constraints from the Big Bang Nucleosynthesis. We utilize this fact to search for the dilaton signature at a lepton collider such as the ongoing Belle II experiment. Further, we demonstrate how to extract the CP property of the dilaton using the variation of the differential cross-section of e + e − → e + e − ϕ with the azimuthal angle between the outgoing leptons. |
| first_indexed | 2024-03-08T10:17:49Z |
| format | Article |
| id | doaj.art-7de8e1a465c54cebbc5bf842614a4a63 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-08T10:17:49Z |
| publishDate | 2024-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-7de8e1a465c54cebbc5bf842614a4a632024-01-28T12:23:26ZengSpringerOpenJournal of High Energy Physics1029-84792024-01-012024112510.1007/JHEP01(2024)153Light dilaton in rare meson decays and extraction of its CP propertySudhakantha Girmohanta0Yuichiro Nakai1Yoshihiro Shigekami2Kohsaku Tobioka3Tsung-Dao Lee Institute, Shanghai Jiao Tong UniversityTsung-Dao Lee Institute, Shanghai Jiao Tong UniversityTsung-Dao Lee Institute, Shanghai Jiao Tong UniversityDepartment of Physics, Florida State UniversityAbstract The dilaton ϕ is a pseudo-Nambu-Goldstone boson associated with the spontaneous breaking of scale invariance in a nearly conformal theory, and couples to the trace of the stress-energy tensor. We analyze experimental constraints on a light dilaton with mass in the MeV–GeV range from rare meson decays. New model-independent inclusive bounds for the b → sϕ transition largely exclude the parameter space of a light dilaton that could explain the muon g − 2 anomaly. Despite similarities between a dilaton and a Higgs-portal scalar, the dilaton-photon coupling is enhanced compared to the Higgs-portal scalar due to contributions from loops of the conformal sector. Consequently, the shortened lifetime of the dilaton relaxes bounds from K → π + invisible searches at the NA62 experiment and constraints from the Big Bang Nucleosynthesis. We utilize this fact to search for the dilaton signature at a lepton collider such as the ongoing Belle II experiment. Further, we demonstrate how to extract the CP property of the dilaton using the variation of the differential cross-section of e + e − → e + e − ϕ with the azimuthal angle between the outgoing leptons.https://doi.org/10.1007/JHEP01(2024)153Extra DimensionsNew Light ParticlesSpecific BSM Phenomenology |
| spellingShingle | Sudhakantha Girmohanta Yuichiro Nakai Yoshihiro Shigekami Kohsaku Tobioka Light dilaton in rare meson decays and extraction of its CP property Journal of High Energy Physics Extra Dimensions New Light Particles Specific BSM Phenomenology |
| title | Light dilaton in rare meson decays and extraction of its CP property |
| title_full | Light dilaton in rare meson decays and extraction of its CP property |
| title_fullStr | Light dilaton in rare meson decays and extraction of its CP property |
| title_full_unstemmed | Light dilaton in rare meson decays and extraction of its CP property |
| title_short | Light dilaton in rare meson decays and extraction of its CP property |
| title_sort | light dilaton in rare meson decays and extraction of its cp property |
| topic | Extra Dimensions New Light Particles Specific BSM Phenomenology |
| url | https://doi.org/10.1007/JHEP01(2024)153 |
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