arXiv 1807.048732018-07hep-ex

用ATLAS实验收集的13个TeV $pp$碰撞数据寻找$γγb\bar{b}$末态中希格斯玻色子对的产生

Search for Higgs boson pair production in the $γγb\bar{b}$ final state with 13 TeV $pp$ collision data collected by the ATLAS experiment

ATLAS Collaboration

备注：: 42 pages in total, author list starting page 26, 7 figures, 4 tables, final version published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2016-15/
发表信息：: JHEP 11 (2018) 040
DOI：: 10.1007/JHEP11(2018)040

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摘要：

搜索进行共振和非共振希格斯玻色子对生产的$γγb\bar{b}$的最终状态。所使用的数据集对应于由欧洲核子研究中心大型强子对撞机的ATLAS探测器记录的质量中心能量为13 TeV的质子-质子碰撞的36.1 fb $^{-1}$的积分光度。未观察到相对于标准模型预期的显著过量。在95%的置信水平下，非共振希格斯玻色子对横截面的观测极限为0.73 pb。这个观测到的极限相当于预测的标准模型横截面的22倍。希格斯玻色子自耦合（$κ_λ= λ_{HHH} / λ_{HHH}^{\rm SM}$）在95%置信水平下被约束为$-8.2 < κ_λ< 13.2$。对于通过X $\rightarrow$ HH $\rightarrow$ $γγb\bar{b}$产生的共振希格斯玻色子对，使用窄宽度近似，给出了在260 GeV $< m_X <$ 1000 GeV范围内作为$m_X$的函数的极限。在此质量范围内，观察到的限值范围为1.1 pb至0.12 pb。

英文摘要：

A search is performed for resonant and non-resonant Higgs boson pair production in the $γγb\bar{b}$ final state. The data set used corresponds to an integrated luminosity of 36.1 fb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. No significant excess relative to the Standard Model expectation is observed. The observed limit on the non-resonant Higgs boson pair cross-section is 0.73 pb at 95% confidence level. This observed limit is equivalent to 22 times the predicted Standard Model cross-section. The Higgs boson self-coupling ($κ_λ= λ_{HHH} / λ_{HHH}^{\rm SM}$) is constrained at 95% confidence level to $-8.2 < κ_λ< 13.2$. For resonant Higgs boson pair production through X $\rightarrow$ HH $\rightarrow$ $γγb\bar{b}$, the limit is presented, using the narrow-width approximation, as a function of $m_X$ in the range 260 GeV $< m_X <$ 1000 GeV. The observed limits range from 1.1 pb to 0.12 pb over this mass range.

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