| Preprint | |
| Report number | arXiv:2410.21444 |
| Title | Probing third-generation New Physics with $K\to \pi \nu\bar\nu$ and $B\to K^{(*)} \nu\bar\nu$ |
| Author(s) | Allwicher, Lukas (Zurich U.) ; Bordone, Marzia (CERN) ; Isidori, Gino (Zurich U.) ; Piazza, Gioacchino (Zurich U.) ; Stanzione, Alfredo (INFN, Trieste ; SISSA, Trieste) |
| Document contact | Contact: arXiv |
| Imprint | 2024-10-28 |
| Number of pages | 10 |
| Note | 10 pages, 6 figures |
| Subject category | hep-ph ; Particle Physics - Phenomenology |
| Abstract | The recent observation of the $K^+ \to \pi^+ \nu\bar\nu$ decay by NA62 is an important milestone in precision flavor physics. Together with evidence of $B^+ \to K^+\nu\bar\nu$ 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. |
| Other source | Inspire |
| Copyright/License | preprint: (License: arXiv nonexclusive-distrib 1.0) |
Rekord stworzony 2024-12-11, ostatnia modyfikacja 2024-12-12