论文标题
$ρ$参数和$ h^0 \ to \ ell_i \ ell_j \ ell_j $在tev无菌中微子中
The $ρ$ parameter and $H^0\to \ell_i \ell_j$ in models with TeV sterile neutrinos
论文作者
论文摘要
大量无菌中微子的存在与活跃的无菌中微子$ n $混合在一起，在循环水平上引起了带电的Lepton领域违反风味的过程。特别是，$ h^0 \ to \ bar {\ ell} _i \ ell_j $的幅度应与重度Yukawa耦合$ y_iy_j = 2 \，s_ {ν_i} s_} s_j} s_jj {ν_jj} {ν_j} {ν_j} \，m_n^2 $^2 $， $ s_ {ν_{i，j}} $表达重度中微子混合物。在这里，我们在中微子部门的最通用扩展中重新审视了这些希格斯的衰变，重点是$ y_ {i} $的大值。我们表明，对这些过程的两个主要贡献之间的去耦效应和取消效果使幅度的幅度比预期的一百倍。我们发现，$ y_ {i} $的扰动值对$ρ$参数做出了可接受的贡献。
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 $y_iy_j=2 \,s_{ν_i} s_{ν_j}\, m_N^2/v^2$, where $s_{ν_{i,j}}$ 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 $ρ$ 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.
