Probing dark sectors with long-lived particles at Belle II
We propose a new search for light scalar singlets in rare meson decays. For couplings well below the electroweak interaction strength, the scalar is long-lived at detector scales and decays into displaced pairs of leptons or light mesons. We show that Belle II has a remarkable potential to probe sca...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
7 May 2020
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| In: |
Physical review
Year: 2020, Volume: 101, Issue: 9 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.101.095006 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.101.095006 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.101.095006 
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| Author Notes: | Anastasiia Filimonova, Ruth Schäfer, and Susanne Westhoff |
| Summary: | We propose a new search for light scalar singlets in rare meson decays. For couplings well below the electroweak interaction strength, the scalar is long-lived at detector scales and decays into displaced pairs of leptons or light mesons. We show that Belle II has a remarkable potential to probe scalars in the GeV range with couplings as small as 10−5. The predicted sensitivity is higher than at the long-baseline experiments NA62 and FASER and comparable with projections for FASER 2. We also investigate signatures of invisibly decaying scalars in rare meson decays with missing energy. |
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| Item Description: | Gesehen am 27.05.2020 |
| Physical Description: | Online Resource |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.101.095006 |