2022/02/25 by Cruz-Albaro, E., Gutiérrez-Rodríguez, A.
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2202.12738
We presented new researches for the sensitivity limits on the weak dipole moments of the top quark-Z boson interactions in the context of the Bestest Little Higgs Model (BLHM). For this purpose, we derive the corresponding Feynman rules. Among the new contributions, there are those arising from the vertices of scalar bosons, vector bosons and heavy quarks contribution: tqiSi, (Si=h0, H0, A0, ϕ0, η0, σ, H±, ϕ±, η±); tqiVi, (Vi= γ, Z, W, Z', W'); and Zqi qi (qi=b, t, B, T, T5, T6, T2/3, T5/3). With these new vertices, we calculate the one-loop contributions to the weak dipole moments aWt and dWt of the top-quark in several scenarios. We found that with the parameters of the BLHM of mA0= 1000 GeV, mη0= 100 GeV, F=4000 GeV, f=[1000, 3000] GeV and tanβ=3, the aWt reaches values with a sensitivity of aWt= 2.49 × 10-4-1.26 × 10-5i, 1.26 × 10-4-5.41× 10-6i, where the main contribution comes from the scalars h0 and H0, which couples to the top-quark of the Standard Model and the top-quarks of the BLHM. These values seem to be out of the reach of the expected experimental sensitivity of present experiments. However, experiments on future colliders are expected to be sensitive enough to measure the AWMDM of the top-quark. Our study complements other studies at the level of one-loop with an extended scalar sector.