Lepton flavor violating $Z$-boson couplings from non-standard Higgs interactions
| Autor: | Goto, Toru, Kitano, Ryuichiro, Mori, Shingo |
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| Rok vydání: | 2015 |
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| Zdroj: | Phys. Rev. D 92, 075021 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.92.075021 |
| Popis: | The Standard Model predicts that the Higgs boson couples to the fermions in the mass eigenstates. We consider the effects of lepton flavor violating (LFV) $Z$ boson couplings in the case where the Higgs boson has flavor non-diagonal Yukawa interactions with the muon and the tau lepton generated from physics beyond the Standard Model. We list the formulae of the couplings of the effective interactions among the $\tau$ lepton, the muon and the $Z$ boson. Using these formulae, we calculate the branching fractions of various leptonic and hadronic LFV $\tau$ decays, and the LFV $Z$ boson decay: $Z\to \tau\mu$. Although the $Z$-boson contributions to LFV tau decays cannot be ignored in terms of the counting of operator dimensions or chirality flipptings, it turns out that they are not very significant for $\tau\to3\mu$ and $\tau\to\mu\rho$ decays. We also calculate the branching fractions of the processes, $\tau\to \mu\pi$, $\tau\to \mu\eta^{(\prime)}$ and $\tau\to\mu a_1$, which are dominated by the $Z$-boson exchanges due to the spin and the parity of the hadrons. Comment: 24 pages, 10 figures |
| Databáze: | arXiv |
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