Charged Higgs pair production in association with the Z0 boson at electron-positron colliders
| Autor: | Nasuf Sonmez |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Particle physics 010308 nuclear & particles physics Branching fraction Physics beyond the Standard Model High Energy Physics::Phenomenology Electron 01 natural sciences law.invention Pair production law 0103 physical sciences Higgs boson High Energy Physics::Experiment 010306 general physics Collider Lepton Boson |
| Zdroj: | Physical Review D. 98 |
| ISSN: | 2470-0029 2470-0010 |
| Popis: | In this paper, the production of the charged Higgs pair associated with the ${Z}^{0}$ boson is analyzed in the minimal extension of the standard model, the so-called two-Higgs-doublet model. The process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{H}^{+}{H}^{\ensuremath{-}}{Z}^{0}$ is calculated at the tree level including all the possible diagrams in the two-Higgs-doublet model. The numerical analysis is performed in consideration of the current experimental constraints and various scenarios for the free parameters of the model. The results are presented as a function of the center-of-mass energy, the charged Higgs mass (${m}_{{H}^{\ifmmode\pm\else\textpm\fi{}}}$), and the ratio of the vacuum expectation values (${t}_{\ensuremath{\beta}}$). The unpolarized cross section, taking into account the results in the flavor physics, gets up to 0.278 fb for ${m}_{{H}^{\ifmmode\pm\else\textpm\fi{}}}=175\text{ }\text{ }\mathrm{GeV}$, and it declines with decreasing ${m}_{{H}^{\ifmmode\pm\else\textpm\fi{}}}$ in type I. However, it gets down to 0.073 fb for ${m}_{{H}^{\ifmmode\pm\else\textpm\fi{}}}=500\text{ }\text{ }\mathrm{GeV}$ in type II. Further, the calculation is also carried out in the nonalignment scenario and low-${m}_{{h}^{0}}$ scenario. The effect of the polarized incoming ${e}^{+}$ and ${e}^{\ensuremath{-}}$ beams shows that the cross section is enhanced by a factor up to 2.5 at $\mathrm{P}(+0.60,\ensuremath{-}0.80)$ polarization configuration. Decay channels of the charged Higgs, possible final states of the process, and some differential distributions belonging to the charged Higgs and ${Z}^{0}$ boson are examined for each scenario. The analysis shows that some channels have a higher branching ratio such as ${H}^{+}\ensuremath{\rightarrow}t\overline{b}$, ${H}^{+}\ensuremath{\rightarrow}{W}^{+}{h}^{0}$, and ${H}^{+}\ensuremath{\rightarrow}{W}^{+}{H}^{0}$. These decay channels are essential in the charged Higgs searches at the lepton colliders for the scenarios interested. The detection of the charged Higgs is a powerful sign for the extended scalar sectors, and the results show the potential of a future lepton collider. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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