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arXiv 1301.3453hep-phhep-ex
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125 GeV希格斯玻色子玻色子和II型跷跷板模型

125 GeV Higgs Boson and the Type-II Seesaw Model

P. S. Bhupal Dev, Dilip Kumar Ghosh, Nobuchika Okada, Ipsita Saha

摘要:

研究了125 GeV类标准模型希格斯玻色子玻色子质量在II型跷跷板模型中的真空稳定性和么正性条件.我们发现,只要跷跷板规模低于SM真空不稳定性的界限,存在一个大的参数空间预测125 GeV的希格斯质量,不管跷跷板规模的精确值,满足稳定性和么正性条件的普朗克尺度。我们还研究了模型预测的希格斯部分衰变宽度的双光子和Z+光子通道相对于他们的SM期望,并发现这两个过程的衰变率是相关的。我们进一步表明,对于任何给定的增强希格斯双光子率超过其SM期望,存在一个上限的第二类跷跷板尺度,因此,在允许的参数空间中的相关的双电荷和单电荷希格斯玻色子的质量。例如,如果希格斯粒子到双光子通道的增强持续超过10%,那么II型跷跷板尺度的上限约为450 GeV,这完全在14 TeV LHC的范围内。我们相信,这是一个令人鼓舞的结果,为单和双电荷希格斯玻色子的实验搜索,结合提高灵敏度的希格斯双光子和希格斯Z+光子信号强度,可以探测整个允许的参数空间的最小II型跷跷板模型,并建立/消除它作为一个单一的可行的扩展SM。

英文摘要:

We study the vacuum stability and unitarity conditions for a 125 GeV Standard Model (SM)-like Higgs boson mass in the type-II seesaw model. We find that, as long as the seesaw scale is introduced below the SM vacuum instability bound, there exists a large parameter space predicting a 125 GeV Higgs mass, irrespective of the exact value of the seesaw scale, satisfying both stability and unitarity conditions up to the Planck scale. We also study the model predictions for the Higgs partial decay widths in the diphoton and Z+photon channels with respect to their SM expectations and find that the decay rates for these two processes are correlated. We further show that for any given enhancement in the Higgs-to-diphoton rate over its SM expectation, there exists an upper bound on the type-II seesaw scale, and hence, on the masses of the associated doubly- and singly-charged Higgs bosons in the allowed parameter space. For instance, if more than 10% enhancement persists in the Higgs-to-diphoton channel, the upper limit on the type-II seesaw scale is about 450 GeV which is completely within the reach of the 14 TeV LHC. We believe this to be an encouraging result for the experimental searches of the singly- and doubly-charged Higgs bosons which, in combination with improved sensitivity in the Higgs-to-diphoton and Higgs-to-Z+photon signal strengths, could probe the entire allowed parameter space of the minimal type-II seesaw model, and establish/eliminate it as a single viable extension of the SM.

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