Global Neutrino Constraints on the Minimal U(1)$_{L_μ-L_τ}$ Model
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| Format: | Preprint |
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2025
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| _version_ | 1866908374788997120 |
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| author | Ibe, Masahiro Shirai, Satoshi Watanabe, Keiichi |
| author_facet | Ibe, Masahiro Shirai, Satoshi Watanabe, Keiichi |
| contents | We examine the minimal U(1)$_{L_μ-L_τ}$ gauge model in light of the latest neutrino data, including neutrino oscillations, cosmological observations, direct mass measurements, and neutrinoless double-beta decay. Using the most conservative oscillation data, we find that normal ordering is excluded at approximately the 90% confidence level (CL). Incorporating cosmological constraints from Cosmic Microwave Background (CMB) observations strengthens this exclusion to about 95% CL, while further including Baryon Acoustic Oscillation (BAO) data increases it to nearly 99% CL. The inverted ordering is even more strongly disfavored. Our analysis is performed within a frequentist framework, minimizing sensitivity to prior assumptions inherent in Bayesian approaches. These results impose strong constraints on the viability of the minimal U(1)$_{L_μ-L_τ}$ gauge model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_01399 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Global Neutrino Constraints on the Minimal U(1)$_{L_μ-L_τ}$ Model Ibe, Masahiro Shirai, Satoshi Watanabe, Keiichi High Energy Physics - Phenomenology We examine the minimal U(1)$_{L_μ-L_τ}$ gauge model in light of the latest neutrino data, including neutrino oscillations, cosmological observations, direct mass measurements, and neutrinoless double-beta decay. Using the most conservative oscillation data, we find that normal ordering is excluded at approximately the 90% confidence level (CL). Incorporating cosmological constraints from Cosmic Microwave Background (CMB) observations strengthens this exclusion to about 95% CL, while further including Baryon Acoustic Oscillation (BAO) data increases it to nearly 99% CL. The inverted ordering is even more strongly disfavored. Our analysis is performed within a frequentist framework, minimizing sensitivity to prior assumptions inherent in Bayesian approaches. These results impose strong constraints on the viability of the minimal U(1)$_{L_μ-L_τ}$ gauge model. |
| title | Global Neutrino Constraints on the Minimal U(1)$_{L_μ-L_τ}$ Model |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2503.01399 |