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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Acceso en línea: | https://arxiv.org/abs/2508.02795 |
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| _version_ | 1866915426669166592 |
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| author | Skrzypek, Barbara Klein, Spencer |
| author_facet | Skrzypek, Barbara Klein, Spencer |
| contents | Recent measurements of astrophysical neutrinos have expanded our understanding of their nature and origin. However, very little is still known about the astrophysical $\barν:ν$
ratio. The only prior measurement is the recent, single Glashow event seen by IceCube. Understanding the astrophysical $\barν:ν$
ratio has a bearing on multiple questions, including the astrophysical spectral shape and neutrino production mechanisms. This analysis uses a new approach to measuring the astrophysical muon $\barν:ν$ ratio at various energies. It uses inelasticity, the fraction of the initial neutrino energy carried away by the hadronic shower. Inelasticity probes the $\barν:ν$
ratio due to the fact that at energies below roughly 100 TeV, valence quarks dominate in deep inelastic scattering interactions, leading to different neutrino and antineutrino inelasticities and cross-sections. We use 10.3 years of IceCube data consisting of starting tracks at energies between 1 TeV and 1 PeV with a self-veto selection that enhances astrophysical event purity in the down-going direction. Based on this sample and analysis method, we present the first measurement of the astrophysical $\barν:ν$
ratio at sub-PeV energies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_02795 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Measuring the Astrophysical $\barν:ν$ Ratio with IceCube Skrzypek, Barbara Klein, Spencer High Energy Astrophysical Phenomena High Energy Physics - Experiment Recent measurements of astrophysical neutrinos have expanded our understanding of their nature and origin. However, very little is still known about the astrophysical $\barν:ν$ ratio. The only prior measurement is the recent, single Glashow event seen by IceCube. Understanding the astrophysical $\barν:ν$ ratio has a bearing on multiple questions, including the astrophysical spectral shape and neutrino production mechanisms. This analysis uses a new approach to measuring the astrophysical muon $\barν:ν$ ratio at various energies. It uses inelasticity, the fraction of the initial neutrino energy carried away by the hadronic shower. Inelasticity probes the $\barν:ν$ ratio due to the fact that at energies below roughly 100 TeV, valence quarks dominate in deep inelastic scattering interactions, leading to different neutrino and antineutrino inelasticities and cross-sections. We use 10.3 years of IceCube data consisting of starting tracks at energies between 1 TeV and 1 PeV with a self-veto selection that enhances astrophysical event purity in the down-going direction. Based on this sample and analysis method, we present the first measurement of the astrophysical $\barν:ν$ ratio at sub-PeV energies. |
| title | Measuring the Astrophysical $\barν:ν$ Ratio with IceCube |
| topic | High Energy Astrophysical Phenomena High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2508.02795 |