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arXiv 1407.6547hep-phhep-ex
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同号双玻色子衰变中双荷希格斯玻色子质量的界

Bounds on the mass of doubly-charged Higgs bosons in the same-sign diboson decay scenario

Shinya Kanemura, Mariko Kikuchi, Kei Yagyu, Hiroshi Yokoya

备注：
28 pages, 11 figures
发表信息：
Phys. Rev. D 90, 115018 (2014)
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摘要：

直接寻找双电荷希格斯玻色子$H^{\pm\pm}$是希格斯三重态模型中最重要的探索之一，其动力学来源于微小中微子质量的产生机制。$H^{\pm\pm}$有两种主要的衰减模式;即，同号双轻子衰变$H^{\pm\pm}\to\ell^\pm\ell^\pm$和同号双玻色子衰变$H^{\pm\pm}\to W^{\pm(*)}W^{\pm(*)}$。对于前一种衰变模式占主导地位的情况，ATLAS和CMS合作组织将$H^{\pm\pm}$的质量下限设定为约400 GeV。另一方面，对于后一种衰减模式占主导地位的情况，过去没有进行专门的搜索。考虑到LEP和LHC实验中双玻子衰变场景中$H^{\pm\pm}$的特征信号，我们发现在碰撞能量为7 TeV时，利用ATLAS合作组的4.7 fb $^{-1}$数据进行同号双轻子搜索，可以得到60-68 GeV的质量下限.我们还表明，极限可以扩展到约85-90 GeV，假设积分亮度为20 fb $^{-1}$和7 TeV的碰撞能量。我们对$H^{\pm\pm}$在相对小质量情况下的衰变性质以及$H^{\pm\pm}$在LHC下次领先QCD阶的产生截面给出了详细的解释。

英文摘要：

A direct search for doubly-charged Higgs bosons $H^{\pm\pm}$ is one of the most important probe in the Higgs Triplet Model, which is motivated by generation mechanisms of tiny neutrino masses. There are two major decay modes of $H^{\pm\pm}$; i.e., the same-sign dilepton decay $H^{\pm\pm}\to\ell^\pm\ell^\pm$ and the same-sign diboson decay $H^{\pm\pm}\to W^{\pm(*)}W^{\pm(*)}$. For the case where the former decay mode is dominant, the lower limit on the mass of $H^{\pm\pm}$ has been set at about 400 GeV by ATLAS and CMS Collaborations. On the other hand, for the case where the latter decay mode is dominant, no dedicated search has been performed in the past. By taking into account characteristic signals of $H^{\pm\pm}$ in the diboson decay scenario at LEP and the LHC experiments, we find that the lower mass bound of 60-68 GeV can be obtained using the same-sign dilepton search performed by ATLAS Collaboration with 4.7 fb$^{-1}$ data at the collision energy of 7 TeV. We also show that the limit can be extended up to about 85-90 GeV, assuming the integrated luminosity of 20 fb$^{-1}$ and 7 TeV for the collision energy. We give detailed explanations on the decay properties of $H^{\pm\pm}$ for relatively small mass cases and also on production cross sections of $H^{\pm\pm}$ at the next-to-leading order of QCD at the LHC.

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