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arXiv 0805.4292hep-ph
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TeV尺度下最小II型跷跷板模型中双荷希格斯玻色子衰变为双轻子的干涉带

Interference bands in decays of doubly-charged Higgs bosons to dileptons in the minimal type-II seesaw model at the TeV scale

Ping Ren, Zhi-zhong Xing

摘要:

在TeV尺度下,研究了双电荷希格斯玻色子H^{ \pm \pm }的双轻子衰变.我们证明了分支比{ \cal B}(H^{ \pm \pm } \to l^\pm_α l^ \pm_β)不仅取决于三个轻中微子v_i(i= 1,2,3)的质量和混合参数,而且还取决于N_1的质量和混合参数。假设N_1的质量在200 GeV-1 TeV范围内,我们计算出ν_1和N_1对{ \cal B}贡献的宽干涉带(H^{ \pm \pm } \to 1 ^ \pm_α 1 ^ \pm_β):\sqrt{|\sinθ_{i4} \sinθ_{j4}|} \sim 10^{-8}--10 ^{-5},其中θ_{i4}和θ_{j 4}测量N_1的带电相互作用的强度。我们通过考虑ν_i的三种典型质量模式,说明了干涉带的一些显著特征,并强调在大型强子对撞机上,在这样一个参数区域内很难区分II型跷跷板模型和三重态跷跷板模型.

英文摘要:

The dileptonic decays of doubly-charged Higgs bosons H^{\pm\pm} are investigated in the minimal type-II seesaw model with one Higgs triplet Δand one heavy Majorana neutrino N_1 at the TeV scale. We show that the branching ratios {\cal B}(H^{\pm\pm} \to l^\pm_αl^\pm_β) 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 200 GeV--1 TeV, we figure out the generous interference bands for the contributions of ν_i and N_1 to {\cal B}(H^{\pm\pm} \to l^\pm_αl^\pm_β): \sqrt{|\sinθ_{i4} \sinθ_{j4}|} \sim 10^{-8}--10^{-5}, where θ_{i4} and θ_{j4} measure the strength of charged-current interactions of N_1. We illustrate some salient features of the interference bands by considering three typical mass patterns of ν_i, and stress that it is very difficult to distinguish the type-II seesaw model from the triplet seesaw model in such a parameter region at the Large Hadron Collider.

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