论文标题
测量希格斯 - 玻色子与单纤维和双基因生产渠道的自我耦合
Measurement of Higgs-boson self-coupling with single-Higgs and double-Higgs production channels
论文作者
论文摘要
可以直接使用Higgs-Boson-Pair生产横截面或通过测量单纤维 - 玻色子生产和衰减模式来直接测量三联链自耦合。实际上，在Electroweak相互作用中的近代领域，Higgs-Decay的部分宽度和主要单higgs生产过程的横截面取决于Higgs-Boson通过弱环的自我耦合。在本文中介绍了$κ_λ$的测量，即三联higgs自耦合的重新缩放。结果是从大型强子对撞机中利用质子 - 普罗顿碰撞数据的结果，其质量为13个TEV的质量为2015年，2016年和2017年，对应于高达79.8 fb $^{ - 1} $的亮度。考虑到最敏感的双HIGGS频道（HH），$ b \ bar {b}τ^+τ^ - $，$ b \ bar {b}γγγ$和$ b \ bar {b bar {b} b \ bar {b \ bar {b} $ vg ggs $ ggs $ ggs（ $ zh $，$ wh $和$ t \ bar {t} h $，以及$ ww^*$，$ zz^*$，$τ^+τ^ - $，$γγ$和$γγ$和$ b \ bar {b} $ decay频道，并结合上述分析（H+HH），以改善$κ_ / $κ_ / $κ_ /在假设新物理学仅影响Higgs-Boson自耦合的假设下，耦合修饰符的H+HH最佳拟合价值的组合为：$κ_λ= 4.6^{+3.2} _ { - 3.8} $，超出$ -2.3 <κ_λ<10.3 prefents in 95 prefents 95％clessitive sefter $ -2.3 <κ_λ<10.3 $ celifors。还提供了更严格的假设的结果，将Higgs-Boson自耦合和其他标准模型耦合解耦。本文的最终结果为迄今为止实验测量结果提供了对$κ_λ$的最严格限制。
The trilinear self-coupling can be measured directly using the Higgs-boson-pair production cross section, or indirectly through the measurement of single-Higgs-boson production and decay modes. In fact, at next-to-leading order in electroweak interaction, the Higgs-decay partial widths and the cross sections of the main single-Higgs production processes depend on the Higgs-boson self-coupling via weak loops. Measurements of $κ_λ$, i.e. the rescaling of the trilinear Higgs self-coupling, are presented in this dissertation. Results are obtained exploiting proton-proton collision data from the Large Hadron Collider at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector in 2015, 2016 and 2017, corresponding to a luminosity of up to 79.8 fb$^{-1}$. Constraints on the Higgs self-coupling are presented considering the most sensitive double-Higgs channels (HH), $b\bar{b}τ^+τ^-$, $b\bar{b}γγ$ and $b\bar{b}b\bar{b}$, considering single-Higgs (H) production modes, $ggF$, $VBF$, $ZH$, $WH$ and $t\bar{t}H$, together with $WW^*$, $ZZ^*$, $τ^+τ^-$, $γγ$ and $b\bar{b}$ decay channels, and combining the aforementioned analyses (H+HH) to improve the sensitivity on $κ_λ$. Under the assumption that new physics affects only the Higgs-boson self-coupling, the combined H+HH best-fit value of the coupling modifier is: $κ_λ= 4.6^{+3.2}_{-3.8}$, excluding values outside the interval $-2.3<κ_λ<10.3$ at 95% confidence level. Results with less stringent assumptions are also provided, decoupling the Higgs-boson self-coupling and the other Standard Model couplings. The final results of this thesis provide the most stringent constraint on $κ_λ$ from experimental measurements to date.
