Low-energy flavour probes of light vector bosons
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2023
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| _version_ | 1866911753128902656 |
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| author | Di Luzio, Luca Levati, Gabriele Paradisi, Paride Díaz, Xavier Ponce |
| author_facet | Di Luzio, Luca Levati, Gabriele Paradisi, Paride Díaz, Xavier Ponce |
| contents | In this work, we construct the chiral Lagrangian for a light spin-1 boson $X$ possessing both vectorial and axial couplings to the light Standard Model quarks $u, d, s$. We then use it in order to describe the tree-level, model-independent contributions to the $ΔS = 1$ transition $K^\pm \rightarrow π^\pm X$, which is induced by Standard Model charged currents and is possibly enhanced by the emission of a longitudinally polarized $X$ boson. Such a flavour observable is then shown to set the best model-independent bounds on the diagonal axial couplings of $X$ to light quarks in the mass range allowed by the decay kinematics, improving the currently available constraints from beam-dump experiments and collider searches. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_07052 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Low-energy flavour probes of light vector bosons Di Luzio, Luca Levati, Gabriele Paradisi, Paride Díaz, Xavier Ponce High Energy Physics - Phenomenology High Energy Physics - Experiment In this work, we construct the chiral Lagrangian for a light spin-1 boson $X$ possessing both vectorial and axial couplings to the light Standard Model quarks $u, d, s$. We then use it in order to describe the tree-level, model-independent contributions to the $ΔS = 1$ transition $K^\pm \rightarrow π^\pm X$, which is induced by Standard Model charged currents and is possibly enhanced by the emission of a longitudinally polarized $X$ boson. Such a flavour observable is then shown to set the best model-independent bounds on the diagonal axial couplings of $X$ to light quarks in the mass range allowed by the decay kinematics, improving the currently available constraints from beam-dump experiments and collider searches. |
| title | Low-energy flavour probes of light vector bosons |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2309.07052 |