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在$\sqrt{s}= 13$ TeV的$pp$碰撞中利用ATLAS探测器搜索$b\bar{b}b\bar{b}$末态下非共振Higgs玻色子对产生

Search for nonresonant pair production of Higgs bosons in the $b\bar{b}b\bar{b}$ final state in $pp$ collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector

ATLAS Collaboration

备注：
55 pages in total, author list starting page 38, 15 figures, 10 tables, published to Phys. Rev. D: Phys. Rev. D 108 (2023) 052003. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2019-29/
发表信息：
Phys. Rev. D 108 (2023) 052003
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AI总结：

本文利用ATLAS探测器126 fb⁻¹的13 TeV质子碰撞数据，在$b\bar{b}b\bar{b}$末态搜索非共振Higgs玻色子对产生，未发现信号，对$HHH$和$HHVV$耦合修正因子及有效场论系数设定了限制。

摘要：

本文介绍了在$b\bar{b}b\bar{b}$末态下非共振Higgs玻色子对产生的搜索。该分析使用了Large Hadron Collider上ATLAS探测器在$\sqrt{s}={13}$ TeV下收集的126 fb$^{-1}$的$pp$碰撞数据，并针对胶子-胶子聚变和矢量玻色子聚变两种产生模式。未发现信号证据，在95%置信水平下，非共振Higgs玻色子对产生截面的观测（预期）上限被确定为Standard Model预测截面的5.4（8.1）倍。对$HHH$和$HHVV$耦合的修正因子施加了限制。$HHH$耦合修正因子$κ_λ$的观测（预期）$2σ$限制被确定为$[-3.5, 11.3]$（$[-5.4, 11.4]$），而$HHVV$耦合修正因子$κ_{2V}$的相应限制为$[-0.0, 2.1]$（$[-0.1, 2.1]$）。此外，在Standard Model有效场论和Higgs有效场论框架下推导了相关系数的限制，并在七种Higgs有效场论基准场景下设定了$HH$产生截面的上限。

英文摘要：

A search for nonresonant Higgs boson pair production in the $b\bar{b}b\bar{b}$ final state is presented. The analysis uses 126 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}={13}$ TeV collected with the ATLAS detector at the Large Hadron Collider, and targets both the gluon-gluon fusion and vector-boson fusion production modes. No evidence of the signal is found and the observed (expected) upper limit on the cross-section for nonresonant Higgs boson pair production is determined to be 5.4 (8.1) times the Standard Model predicted cross-section at 95% confidence level. Constraints are placed on modifiers to the $HHH$ and $HHVV$ couplings. The observed (expected) $2σ$ constraints on the $HHH$ coupling modifier, $κ_λ$, are determined to be $[-3.5, 11.3]$ ($[-5.4, 11.4]$), while the corresponding constraints for the $HHVV$ coupling modifier, $κ_{2V}$, are $[-0.0, 2.1]$ ($[-0.1, 2.1]$). In addition, constraints on relevant coefficients are derived in the context of the Standard Model effective field theory and Higgs effective field theory, and upper limits on the $HH$ production cross-section are placed in seven Higgs effective field theory benchmark scenarios.

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