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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2404.06533 |
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| _version_ | 1866912103806271488 |
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| author | Marzocca, David Nardecchia, Marco Stanzione, Alfredo Toni, Claudio |
| author_facet | Marzocca, David Nardecchia, Marco Stanzione, Alfredo Toni, Claudio |
| contents | We study the implications of the observed excess in $B^+ \to K^+ ν\barν$ under the assumption of Rank-One Flavour Violation, i.e. that New Physics couples to a single specific direction in flavour space. By varying this direction we perform analyses at the level of the low-energy EFT, the SMEFT, and with explicit mediators such as leptoquarks and colorless vectors ($Z^\prime$ and $V^\prime$). We study correlations with other flavour, electroweak and collider observables, finding that the most interesting ones are with $K \to πν\barν$, $B_s \to μ^+ μ^-$, meson mixing and the LHC searches in $τ^+ τ^-$ high-energy tails. Among the various mediators, the scalar leptoquarks $\tilde{R}_2$ and $S_1$ offer the best fits of the Belle-II excess, while being consistent with the other bounds. On the other hand, colorless vectors are strongly constrained by meson mixing and resonance searches in $p p \to τ^+ τ^-$. In all cases we find that a flavour alignment close to the third generation is generically preferred. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_06533 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Implications of $B \to K ν\barν$ under Rank-One Flavor Violation hypothesis Marzocca, David Nardecchia, Marco Stanzione, Alfredo Toni, Claudio High Energy Physics - Phenomenology We study the implications of the observed excess in $B^+ \to K^+ ν\barν$ under the assumption of Rank-One Flavour Violation, i.e. that New Physics couples to a single specific direction in flavour space. By varying this direction we perform analyses at the level of the low-energy EFT, the SMEFT, and with explicit mediators such as leptoquarks and colorless vectors ($Z^\prime$ and $V^\prime$). We study correlations with other flavour, electroweak and collider observables, finding that the most interesting ones are with $K \to πν\barν$, $B_s \to μ^+ μ^-$, meson mixing and the LHC searches in $τ^+ τ^-$ high-energy tails. Among the various mediators, the scalar leptoquarks $\tilde{R}_2$ and $S_1$ offer the best fits of the Belle-II excess, while being consistent with the other bounds. On the other hand, colorless vectors are strongly constrained by meson mixing and resonance searches in $p p \to τ^+ τ^-$. In all cases we find that a flavour alignment close to the third generation is generically preferred. |
| title | Implications of $B \to K ν\barν$ under Rank-One Flavor Violation hypothesis |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2404.06533 |