Addressing the CKM unitarity problem with a vector-like up quark
| Autor: | J. T. Penedo, Pedro M. F. Pereira, Gustavo C. Branco, M. N. Rebelo, J. I. Silva-Marcos |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Nuclear and High Energy Physics Top quark Particle physics Unitarity Meson 010308 nuclear & particles physics Cabibbo–Kobayashi–Maskawa matrix High Energy Physics::Phenomenology FOS: Physical sciences Order (ring theory) QC770-798 01 natural sciences High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) CP violation Nuclear and particle physics. Atomic energy. Radioactivity Beyond Standard Model 0103 physical sciences Up quark High Energy Physics::Experiment 010306 general physics Energy (signal processing) Quark Masses and SM Parameters |
| Zdroj: | Journal of High Energy Physics Journal of High Energy Physics, Vol 2021, Iss 7, Pp 1-24 (2021) |
| Popis: | We point out that hints of deviations from unitarity in the first row of the CKM matrix may be explained by the presence of a single vector-like top. We study how the stringent experimental constraints arising from CP Violation in the kaon sector and from meson mixing such as $D^0$-$\overline{D}^0$, $K^0$-$\overline{K}^0$ and $B^0_{d,s}$-$\overline{B}^0_{d,s}$ can be satisfied in the proposed framework. In order for the deviations from unitarity to be of the required size while keeping the theory perturbative, the new top quark should have a mass $m_T \lesssim 7$ TeV which could be probed in upcoming experiments at the energy frontier. 24 pages, 4 figures, 2 tables; comments and references added |
| Databáze: | OpenAIRE |
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