Searches for Higgs boson pair production at the High Luminosity Large Hadron Collider (HL-LHC) with the ATLAS experiment

欧洲核子研究中心（CERN）的大型强子对撞机（LHC）将于2022年底进行升级，这将增加其输送的能量，并探索新的能源前沿。希格斯玻色子的自耦合是粒子物理标准模型预测的一个重要参数，目前仍有待发现。这项研究在有希望的byyy最终状态下寻找双希格斯粒子的产生，其中一个希格斯粒子衰变成一个b和反b夸克，另一个衰变成一对光子。我开发了一种基于权重的方法来利用可用的低统计数据。还实现了一个增强决策树（BDT），以进一步增加从HL-LHC预期的巨大背景中检测HH- b> bbyy信号的机会。

The Large Hadron Collider (LHC) at CERN will be undergoing an upgrade at the end of 2022 which will increase its delivered energy and probe the new energy frontier. The Higgs boson self coupling is an important parameter predicted by the standard model of particle physics that is still yet to be discovered. This study looks for di-Higgs production in the promising bbyy final state, with one Higgs decaying to a b and anti-b quark and the 2nd to a pair of photons. I have developed a method based on weights to exploit the low statistics available. Also implemented a Boosted Decision Tree (BDT) to further increase the chance of detecting the HH->bbyy signal from the huge backgrounds expected at the HL-LHC.