arXiv 1410.34712014-10hep-phhep-ex

SM D=6扩展中的希格斯玻色子对产生

Higgs boson pair production in the D=6 extension of the SM

Florian Goertz, Andreas Papaefstathiou, Li Lin Yang, José Zurita

备注：: 34 pages, 11 figures. Matches Journal version
DOI：: 10.1007/JHEP04(2015)167

摘要：

我们得到的限制，可以施加在6维有效的理论扩展的标准模型，使用胶子融合引发的希格斯玻色子对生产在大型强子对撞机。我们使用一个现实的分析集中在$hh \rightarrow (b\bar{b}) ( τ^+ τ^- )$的最终状态，包括初始状态的辐射和非微扰效应。我们包括信号速率的统计不确定性以及理论不确定性的保守估计。我们首先考虑一个理论只包含修改的三线性耦合，通过$c_6 λ\, H^6/ v^2$拉格朗日项，然后检查的有效理论的完整的参数空间，将通过单一的希格斯玻色子玻色子测量获得的电流边界。我们还考虑了一种替代方案，其中我们改变了一个较小的参数子集。允许，最后，其他系数的值在\textit{projected}实验范围内变化，我们发现，目前无界的参数，$c_6$，可以被约束到位于$|c_6| \lesssim 0.6$在1 $σ$置信度，在年底的高亮度运行的大型强子对撞机（14 TeV）在完整的模型，和$-0.6 \lesssim c_6 \lesssim 0.5$在替代模型。这项研究构成了第一步纳入多希格斯玻色子玻色子生产完全适合的6维有效场论框架。

英文摘要：

We derive the constraints that can be imposed on the dimension-6 effective theory extension of the Standard Model, using gluon fusion-initiated Higgs boson pair production at the LHC. We use a realistic analysis focussing on the $hh \rightarrow (b\bar{b}) ( τ^+ τ^- )$ final state, including initial-state radiation and non-perturbative effects. We include the statistical uncertainties on the signal rates as well as conservative estimates of the theoretical uncertainties. We first consider a theory containing only modifications of the trilinear coupling, through a $c_6 λ\, H^6/ v^2$ Lagrangian term, and then examine the full parameter space of the effective theory, incorporating current bounds obtained through single Higgs boson measurements. We also consider an alternative scenario, where we vary a smaller sub-set of parameters. Allowing, finally, the values of the other coefficients to vary within \textit{projected} experimental ranges, we find that the currently unbounded parameter, $c_6$, could be constrained to lie within $|c_6| \lesssim 0.6$ at 1$σ$ confidence, at the end of the high-luminosity run of the LHC (14~TeV) in the full model, and to $-0.6 \lesssim c_6 \lesssim 0.5$ in the alternative model. This study constitutes a first step towards the inclusion of multi-Higgs boson production in a full fit to the dimension-6 effective field theory framework.

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