Measurements of Higgs boson properties in the diphoton decay channel with 36 fb$^{-1}$ of $pp$ collision data at $\sqrt{s} = 13$ TeV with the ATLAS detector
Measurements of Higgs boson properties in the diphoton decay channel with 36 fb$^{-1}$ of $pp$ collision data at $\sqrt{s} = 13$ TeV with the ATLAS detector
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DOI：
10.1103/physrevd.98.052005
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
Atlas Collaboration
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作者：
Atlas Collaboration
在大型强子对撞机上的ATLAS实验中，利用36.1Fb=13$TeV的质子-质子碰撞数据，测量了双光子终态下希格斯玻色子的性质。报道了通过胶子-胶子融合、矢量-玻色子融合以及与矢量玻色子或顶夸克对联合产生希格斯玻色子的截面测量结果。信号强度，定义为观察到的信号产量与预期信号产量的比率，对这些生产过程中的每一个以及包括在内进行测量。全球信号强度测量$0.99\pm 0.14$的精度比ATLAS的测量精度提高了两倍。测量胶子-胶子融合和矢量-玻色子融合产物产生的信号强度与标准模型预测一致。报道了用于量化相空间特定区域内不同Higgs玻色子产生过程的简化模板截面的测量结果。在一个与实验光子选择密切匹配的基准区，测得希格斯玻色子衰变为两个孤立光子的截面为$55\pm 10$fb，这与标准模型预测的$\pm 2$fb很好地一致。此外，报告了在矢量-玻色子聚变中或与大的缺失横向动量、轻子或顶夸克对有关的富含希格斯玻色子的基准区的截面。对与双光子运动学以及与希格斯玻色子相关的喷流的运动学和多重性有关的几个变量进行了微分和双微分测量。没有观察到与广泛的标准模型预测有显著偏差。
Properties of the Higgs boson are measured in the two-photon final state using 36.1 fb$^{-1}$ of proton-proton collision data recorded at $\sqrt{s} = 13$ TeV by the ATLAS experiment at the Large Hadron Collider. Cross-section measurements for the production of a Higgs boson through gluon-gluon fusion, vector-boson fusion, and in association with a vector bosonor a top-quark pair are reported. The signal strength, defined as the ratio of the observed to the expected signal yield, is measured for each of these production processes as well as inclusively. The global signal strength measurement of $0.99 \pm 0.14$ improves on the precision of the ATLAS measurement at $\sqrt{s} = 7$ and 8 TeV by a factor of two. Measurements of gluon-gluon fusion and vector-boson fusion productions yield signal strengths compatible with the Standard Model prediction. Measurements of simplified template cross sections, designed to quantify the different Higgs boson production processes in specific regions of phase space, are reported. The cross section for the production of the Higgs boson decaying to two isolated photons in a fiducial region closely matching the experimental selection of the photons is measured to be $55 \pm 10$ fb, which is in good agreement with the Standard Model prediction of $64 \pm 2$ fb. Furthermore, cross sections in fiducial regions enriched in Higgs boson production in vector-boson fusion or in association with large missing transverse momentum, leptons or top-quark pairs are reported. Differential and double-differential measurements are performed for several variables related to the diphoton kinematics as well as the kinematics and multiplicity of the jets produced in association with a Higgs boson. No significant deviations from a wide array of Standard Model predictions are observed.