تقرير
The $\rho$ parameter and $H^0\to \ell_i \ell_j$ in models with TeV sterile neutrinos
| العنوان: | The $\rho$ parameter and $H^0\to \ell_i \ell_j$ in models with TeV sterile neutrinos |
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| المؤلفون: | Hernández-Tomé, G., Illana, J. I., Masip, M. |
| المصدر: | Phys. Rev. D 102, 113006 (2020) |
| سنة النشر: | 2020 |
| المجموعة: | High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology |
| الوصف: | The presence of massive sterile neutrinos $N$ mixed with the active ones induces flavor violating processes in the charged lepton sector at the loop level. In particular, the amplitude of $H^0\to \bar{\ell}_i\ell_j$ is expected to be proportional to the product of heavy-light Yukawa couplings $y_iy_j=2 \,s_{\nu_i} s_{\nu_j}\, m_N^2/v^2$, where $s_{\nu_{i,j}}$ express the heavy-light neutrino mixings. Here we revisit these Higgs decays in the most generic extension of the neutrino sector, focusing on large values of $y_{i}$. We show that decoupling effects and a cancellation between the two dominant contributions to these processes makes the amplitude about one hundred times smaller than anticipated. We find that perturbative values of $y_{i}$ giving an acceptable contribution to the $\rho$ parameter imply ${\cal B}(H^0\to \bar{\ell}_i\ell_j)<10^{-8}$ for any lepton flavors, a rate that is not accessible at current colliders. Comment: Comments and references added, version accepted for publication in PRD |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevD.102.113006 |
| URL الوصول: | http://arxiv.org/abs/2005.11234 |
| رقم الأكسشن: | edsarx.2005.11234 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevD.102.113006 |
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