A new look at $b \to s$ observables in 331 models
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866909079275831296 |
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| author | Loparco, Francesco |
| author_facet | Loparco, Francesco |
| contents | Flavour changing neutral current (FCNC) processes are described by loop diagrams in the Standard Model (SM), while in 331 models, based on the gauge group $\text{SU}(3)_C \times \text{SU}(3)_L \times \text{U}(1)_X$, they are dominated by tree-level exchanges of a new heavy neutral gauge boson $Z'$. Exploiting this feature, observables related to FCNC decays of $K$, $B_d$ and $B_s$ mesons can be considered in several variants of 331 models. The variants are distinguished by the value of a parameter $β$ that plays a key role in this framework. Imposing constraints on the $ΔF = 2$ observables, we select possible ranges for the mass of the $Z'$ boson in correspondence to the values $β= \pm k / \sqrt{3}$, with $k = 1, 2$. The results are used to determine the impact of 331 models on $b \to s$ processes and on the correlations among them, in the light of new experimental data recently released. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_11999 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A new look at $b \to s$ observables in 331 models Loparco, Francesco High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice Flavour changing neutral current (FCNC) processes are described by loop diagrams in the Standard Model (SM), while in 331 models, based on the gauge group $\text{SU}(3)_C \times \text{SU}(3)_L \times \text{U}(1)_X$, they are dominated by tree-level exchanges of a new heavy neutral gauge boson $Z'$. Exploiting this feature, observables related to FCNC decays of $K$, $B_d$ and $B_s$ mesons can be considered in several variants of 331 models. The variants are distinguished by the value of a parameter $β$ that plays a key role in this framework. Imposing constraints on the $ΔF = 2$ observables, we select possible ranges for the mass of the $Z'$ boson in correspondence to the values $β= \pm k / \sqrt{3}$, with $k = 1, 2$. The results are used to determine the impact of 331 models on $b \to s$ processes and on the correlations among them, in the light of new experimental data recently released. |
| title | A new look at $b \to s$ observables in 331 models |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2401.11999 |