反常VVH和VVHH对在ILC上测定Higgs自耦合的影响
Influence of anomalous VVH and VVHH on determination of Higgs self couplings at ILC
摘要：
最近在大型强子对撞机上发现了希格斯玻色子玻色子，同时确立了希格斯机制作为电弱对称破缺的方式，开启了一个精确测量希格斯玻色子玻色子的时代。在一个有效的拉格朗日框架下，我们考虑e+e-> ZHH过程，在质心能量为800 GeV的ILC上，研究了ZHH和ZZHH耦合对HHH耦合对该过程灵敏度的影响.我们的结果表明三线性Higgs自耦合对这一过程的敏感性对Higgs-规范玻色子耦合有较强的依赖性。在与HHH耦合有关的有效耦合c6和cH上得到了积分亮度为1000 /fb的ILC的单参数和双参数范围，指出了这些极限是如何受到反常ZZH和ZZHH耦合的影响的。为了解反常耦合的影响而研究的运动学分布再次显示了Z-H耦合对这些分布对HHH耦合的依赖性的强烈影响。类似的结果表明，在过程的情况下，e+e-> nu nu HH，认为在质心能量为2 TeV，其中的截面是足够大的。WWH和WWHH耦合对HHH耦合灵敏度的影响通过我们对该过程的分析清楚地建立。
英文摘要：
The recent discovery of a Higgs boson at LHC, while establishing the Higgs mechanism as the way of electroweak symmetry breaking, started an era of precision measurements involving the Higgs boson. In an effective Lagrangian framework, we consider the e+e- --> ZHH process, at an ILC running at a centre of mass energy of 800 GeV to investigate the effect of the ZZH and ZZHH couplings on the sensitivity of HHH coupling on this process. Our results show that the sensitivity of the trilinear Higgs self couplings on this process has somewhat strong dependence on the Higgs-gauge boson couplings. Single and two parameter reach of ILC with integrated luminosity of 1000 /fb are obtained on the effective couplings, c6 and cH, which are related to the HHH couplings, indicating how these limits are affected by the presence of anomalous ZZH and ZZHH couplings. The kinematic distributions studied to understand the effect of the anomalous couplings, again, show strong influence of Z-H couplings on the dependence of these distributions on HHH coupling. Similar results are indicated in the case of the process, e+e- --> nu nu HH, considered at a centre of mass energy of 2 TeV, where the cross section is large enough. The effect of WWH and WWHH couplings on the sensitivity of HHH coupling is clearely established through our analyses of this process.
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