arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.04240hep-phhep-ex
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在$b\bar{b}b\bar{b}$最终状态下使用深度学习进行Higgs自耦合测量

Higgs self-coupling measurements using deep learning in the $b\bar{b}b\bar{b}$ final state

Jacob Amacker, William Balunas, Lydia Beresford, Daniela Bortoletto, James Frost, Cigdem Issever, Jesse Liu, James McKee, Alessandro Micheli, Santiago Paredes S… 展开作者

Jacob Amacker, William Balunas, Lydia Beresford, Daniela Bortoletto, James Frost, Cigdem Issever, Jesse Liu, James McKee, Alessandro Micheli, Santiago Paredes Saenz, Michael Spannowsky, Beojan Stanislaus

摘要:

测量希格斯三线性自耦合$λ_{hhh}$在实验上要求很高,但对于理解希格斯势的形状来说却是基础。我们提出了一个全面的分析策略,在HL-LHC使用双希格斯事件的四个$b$ -夸克通道($hh \to 4b$),扩展目前的方法在几个方向。我们执行深度学习,通过专门针对BSM $λ_{hhh}$场景的优化来抑制强大的多射流背景。我们比较了$λ_{hhh}$约束功率的事件,使用不同的多重性的大半径喷流与一个双管齐下的结构,重建提升$h \to bb$衰变。我们表明,目前的不确定性,在SM顶部汤川耦合$y_t$可以修改$λ_{hhh}$约束$\sim 20\%$。对于SM $y_t$,我们发现在简化假设下,对于HL-LHC数据的3000~fb $^{-1}$,$-0.8 < λ_{hhh} / λ_{hhh}^\text{SM} < 6.6$在68%CL下的前景。我们的研究结果提供了一个仔细的评估的di-希格斯识别和机器学习技术的希格斯自耦合的全强子测量和锐化的要求,为未来的改进。

英文摘要:

Measuring the Higgs trilinear self-coupling $λ_{hhh}$ is experimentally demanding but fundamental for understanding the shape of the Higgs potential. We present a comprehensive analysis strategy for the HL-LHC using di-Higgs events in the four $b$-quark channel ($hh \to 4b$), extending current methods in several directions. We perform deep learning to suppress the formidable multijet background with dedicated optimisation for BSM $λ_{hhh}$ scenarios. We compare the $λ_{hhh}$ constraining power of events using different multiplicities of large radius jets with a two-prong structure that reconstruct boosted $h \to bb$ decays. We show that current uncertainties in the SM top Yukawa coupling $y_t$ can modify $λ_{hhh}$ constraints by $\sim 20\%$. For SM $y_t$, we find prospects of $-0.8 < λ_{hhh} / λ_{hhh}^\text{SM} < 6.6$ at 68% CL under simplified assumptions for 3000~fb$^{-1}$ of HL-LHC data. Our results provide a careful assessment of di-Higgs identification and machine learning techniques for all-hadronic measurements of the Higgs self-coupling and sharpens the requirements for future improvement.

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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