Light Dilaton in Rare Meson Decays and Extraction of its CP Property
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866929268337934336 |
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| author | Girmohanta, Sudhakantha Nakai, Yuichiro Shigekami, Yoshihiro Tobioka, Kohsaku |
| author_facet | Girmohanta, Sudhakantha Nakai, Yuichiro Shigekami, Yoshihiro Tobioka, Kohsaku |
| contents | 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 $b \to s ϕ$ 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 $K \to π$ + 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 $e^+ e^- \to e^+ e^- ϕ$ with the azimuthal angle between the outgoing leptons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_16882 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Light Dilaton in Rare Meson Decays and Extraction of its CP Property Girmohanta, Sudhakantha Nakai, Yuichiro Shigekami, Yoshihiro Tobioka, Kohsaku High Energy Physics - Phenomenology High Energy Physics - Experiment 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 $b \to s ϕ$ 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 $K \to π$ + 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 $e^+ e^- \to e^+ e^- ϕ$ with the azimuthal angle between the outgoing leptons. |
| title | Light Dilaton in Rare Meson Decays and Extraction of its CP Property |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2310.16882 |