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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.02733 |
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| _version_ | 1866918228331069440 |
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| author | Kretz, Tim |
| author_facet | Kretz, Tim |
| contents | In modern experiments on flavour physics it is possible to search for the decays of $B$ or $D$ mesons or $τ$ leptons into final states with heavy neutrinos $N$ (a.k.a. heavy neutral leptons). I present a common study of theorists and experimentalists from Belle II on constraints on $B \rightarrow D^{*} \ell N$. Next I discuss the status of the theory predictions of the various $N$ decay rates. In scenarios in which $N$ interacts with SM particles only through sterile-active neutrino mixing, the dependence of the lifetime on the relevant mixing angles is important to determine whether $N$ decays in the detector or outside. To calculate the inclusive decay rate into semi-hadronic final states reliably one needs to include radiative QCD corrections. I present analytic results for the QCD-corrected decay rates and discuss their phenomenological impact. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_02733 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Heavy sterile neutrinos in $B$ decays and new QCD corrections to their semi-hadronic decay rates Kretz, Tim High Energy Physics - Phenomenology In modern experiments on flavour physics it is possible to search for the decays of $B$ or $D$ mesons or $τ$ leptons into final states with heavy neutrinos $N$ (a.k.a. heavy neutral leptons). I present a common study of theorists and experimentalists from Belle II on constraints on $B \rightarrow D^{*} \ell N$. Next I discuss the status of the theory predictions of the various $N$ decay rates. In scenarios in which $N$ interacts with SM particles only through sterile-active neutrino mixing, the dependence of the lifetime on the relevant mixing angles is important to determine whether $N$ decays in the detector or outside. To calculate the inclusive decay rate into semi-hadronic final states reliably one needs to include radiative QCD corrections. I present analytic results for the QCD-corrected decay rates and discuss their phenomenological impact. |
| title | Heavy sterile neutrinos in $B$ decays and new QCD corrections to their semi-hadronic decay rates |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2512.02733 |