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arXiv 0812.0520hep-ph
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TeV尺度下最小型(I+ II)跷跷板模型中单荷希格斯玻色子的轻子数破坏衰变

Lepton-number-violating decays of singly-charged Higgs bosons in the minimal type-(I+II) seesaw model at the TeV scale

Ping Ren, Zhi-zhong Xing

摘要:

在TeV尺度下,研究了含SU(2)_L Higgs三重态Δ和重Majorana中微子N_1的最小(I+II)型跷跷板模型中单电荷希格斯玻色子H^ \pm的轻子数破坏衰变.我们发现分支比{ \cal B}(H^+ \to 1 ^+_α{ \bar v})(α= e,μ,τ)不仅依赖于三个轻中微子的质量和混合参数ν_i(i = 1,2,3),而且依赖于N_1的质量和混合参数。假设N_1的质量在200 GeV到1 TeV的范围内,我们计算出ν_i和N_1对{ \cal B}(H^+ \to 1 ^+_α{ \bar ν})的贡献的宽干涉带。我们通过考虑ν_i的三种典型质量模式来说明这种干扰效应的一些显著特征,并表明相关的Majorana CP破坏相可以影响在这个参数区域中{ \cal B}(H^+ \to l^+_α{ \bar ν})的幅度。

英文摘要:

The lepton-number-violating decays of singly-charged Higgs bosons H^\pm are investigated in the minimal type-(I+II) seesaw model with one SU(2)_L Higgs triplet Δand one heavy Majorana neutrino N_1 at the TeV scale. We find that the branching ratios {\cal B}(H^+ \to l^+_α{\bar ν}) (for α= e, μ, τ) depend not only on the mass and mixing parameters of three light neutrinos ν_i (for i = 1, 2, 3) but also on those of N_1. Assuming the mass of N_1 to lie in the range of 200 GeV to 1 TeV, we figure out the generous interference bands for the contributions of ν_i and N_1 to {\cal B}(H^+ \to l^+_α{\bar ν}). We illustrate some salient features of such interference effects by considering three typical mass patterns of ν_i, and show that the relevant Majorana CP-violating phases can affect the magnitudes of {\cal B}(H^+ \to l^+_α{\bar ν}) in this parameter region.

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