Probing third-generation New Physics with $K\to πν\barν$ and $B\to K^{(*)} ν\barν$
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| Format: | Preprint |
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2024
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| _version_ | 1866915127632068608 |
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| author | Allwicher, Lukas Bordone, Marzia Isidori, Gino Piazza, Gioacchino Stanzione, Alfredo |
| author_facet | Allwicher, Lukas Bordone, Marzia Isidori, Gino Piazza, Gioacchino Stanzione, Alfredo |
| contents | The recent observation of the $K^+ \to π^+ ν\barν$ decay by NA62 is an important milestone in precision flavor physics. Together with evidence of $B^+ \to K^+ν\barν$ reported by Belle-II, they are the only FCNC decays involving third-family leptons where a precision close to the SM expectation has been reached. We study the implications of these recent results in the context of a new physics scenario aligned to the third generation, with an approximate $U(2)^5$ flavor symmetry acting on the light families. We find that the slight excess observed in both channels supports the hypothesis of non-standard TeV dynamics of this type, as also hinted at by other $B$-meson decays, consistently with bounds from colliders and electroweak observables. We further discuss how future improvements in precision could affect this picture, highlighting the discovery potential in these di-neutrino modes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_21444 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Probing third-generation New Physics with $K\to πν\barν$ and $B\to K^{(*)} ν\barν$ Allwicher, Lukas Bordone, Marzia Isidori, Gino Piazza, Gioacchino Stanzione, Alfredo High Energy Physics - Phenomenology The recent observation of the $K^+ \to π^+ ν\barν$ decay by NA62 is an important milestone in precision flavor physics. Together with evidence of $B^+ \to K^+ν\barν$ reported by Belle-II, they are the only FCNC decays involving third-family leptons where a precision close to the SM expectation has been reached. We study the implications of these recent results in the context of a new physics scenario aligned to the third generation, with an approximate $U(2)^5$ flavor symmetry acting on the light families. We find that the slight excess observed in both channels supports the hypothesis of non-standard TeV dynamics of this type, as also hinted at by other $B$-meson decays, consistently with bounds from colliders and electroweak observables. We further discuss how future improvements in precision could affect this picture, highlighting the discovery potential in these di-neutrino modes. |
| title | Probing third-generation New Physics with $K\to πν\barν$ and $B\to K^{(*)} ν\barν$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2410.21444 |