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arXiv 1108.2274hep-phhep-ex
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提高黄金通道中希格斯玻色子玻色子搜索的灵敏度

Improving the sensitivity of Higgs boson searches in the golden channel

James S. Gainer, Kunal Kumar, Ian Low, Roberto Vega-Morales

摘要:

希格斯玻色子玻色子在ZZ* 通道中的轻子衰变产生了被称为黄金通道的物质,这是由于其干净的签名和良好的总不变质量分辨率。此外,完整的运动学分布的衰变产物可以重建,然而,这是不考虑在传统的搜索策略只依赖于测量的总不变质量。在这项工作中,我们实现了一种类型的多元分析称为矩阵元素的方法,它利用希格斯玻色子和占主导地位的不可约背景从q bar{q} -> ZZ* 之间的完全生产和衰变矩阵元素的差异。给出了信号和背景的微分分布的解析表达式。我们进行了研究的大型强子对撞机在sqrt{s}=7 TeV的希格斯质量之间的175和350 GeV。我们发现,当积分亮度为2.5 fb^-1或更高时,在高质量区域,信号和背景之间的角相关差异最明显,发现意义和排除极限都可以得到10 - 20%的改善。

英文摘要:

Leptonic decays of the Higgs boson in the ZZ* channel yield what is known as the golden channel due to its clean signature and good total invariant mass resolution. In addition, the full kinematic distribution of the decay products can be reconstructed, which, nonetheless, is not taken into account in traditional search strategy relying only on measurements of the total invariant mass. In this work we implement a type of multivariate analysis known as the matrix element method, which exploits differences in the full production and decay matrix elements between the Higgs boson and the dominant irreducible background from q bar{q} -> ZZ*. Analytic expressions of the differential distributions for both the signal and the background are also presented. We perform a study for the Large Hadron Collider at sqrt{s}=7 TeV for Higgs masses between 175 and 350 GeV. We find that, with an integrated luminosity of 2.5 fb^-1 or higher, improvements in the order of 10 - 20 % could be obtained for both discovery significance and exclusion limits in the high mass region, where the differences in the angular correlations between signal and background are most pronounced.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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