First constraint on the mass of doubly-charged Higgs bosons in the same-sign diboson decay scenario at the LHC
First constraint on the mass of doubly-charged Higgs bosons in the same-sign diboson decay scenario at the LHC
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DOI：
10.1016/j.physletb.2013.08.054
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发表时间：
2013-05
影响因子：
4.4
通讯作者：
S. Kanemura;K. Yagyu;H. Yokoya
中科院分区：
文献类型：
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作者：
S. Kanemura;K. Yagyu;H. Yokoya
当双电荷希格斯玻色子H±±主要衰变为同号双轻子时，根据目前的LHC数据，质量下限约为400GeV。另一方面，在同号双玻色子衰变H±±→W±(⁎)W±(⁎)占主导地位的情况下，利用LEP和大型强子对撞机的数据没有报道过这样的界限。我们利用目前的实验数据研究了这种情况下的质量极限。从LEP实验对Z玻色子总宽度的精确测量中，排除了43GeV以下的质量，置信度为95%。事实证明，LEP的四次带电轻子搜索的结果并没有提供任何明显的限制。结果表明，在大型强子对撞机的双玻色子衰变情形下，碰撞能量为7TeV，积分光度为4.7FB−1，得到了一个新的下限。利用同号双轻子事件的数据，在95%的置信度水平下，下限为60GeV。通过将数据外推到具有相同碰撞能量的20FB−1，估计下限为85GeV。
When the doubly-charged Higgs bosons H±±mainly decay into the same-sign dilepton, a lower bound on the mass is around 400 GeV by the current LHC data. On the other hand, no such bound has been reported by using the data at LEP and at the LHC for the case where the same-sign diboson decay H±±→ W±(⁎) W±(⁎) is dominant. We study limits on the mass for such a case by using the current experimental data. From the precise measurement of the total width of the Z boson at the LEP experiment, the mass below 43 GeV is excluded with the 95% confidence level. It turns out that the results from four charged-lepton searches at LEP do not provide any significant constraint. We show that a new lower bound is obtained in the diboson decay scenario at the LHC with the collision energy to be 7 TeV and the integrated luminosity to be 4.7 fb− 1. By using the data of the same-sign dilepton events, the lower limit is found to be 60 GeV at the 95% confidence level. By the extrapolation of the data to 20 fb− 1 with the same collision energy, the lower limit is evaluated to be 85 GeV.