Searches for Higgs pair production with the ATLAS Experiment at the LHC

2012年，ATLAS和CMS的合作宣布了希格斯玻色子的发现，自那以来，在测量其性质方面取得了实质性进展，包括质量、自旋和与其他粒子的耦合。然而，弱电对称破缺(ESWB)的最终检验只能通过重构特征墨西哥帽势来实现。通过产生希格斯玻色子对测量希格斯自耦合提供了一种独特的直接探测这一势的方法，给出了标准模型中许多未决问题的关键解决办法。Di-Higgs产生的截面大约比单个Higgs产生截面小1000倍。分析将使用运行2和部分运行3期间来自ATLAS探测器的数据。它将约束双希格斯产生截面和自耦合，并对各种共振和非共振新物理模型设定限制。分析将使用其中一个希格斯衰变为b夸克，另一个衰变为一对tau轻子的事件，并将重点放在两个tau强子衰变的通道上。

The discovery of Higgs boson was announced by the ATLAS and the CMS collaborations in 2012 and since then a substantial progress has been made measuring its properties, including mass, spin and couplings to other particles. However, the ultimate test of electroweak symmetry breaking (ESWB) can only be obtained by reconstructing the characteristic Mexican-hat-shaped potential. Measurement of the Higgs self-coupling via production of Higgs boson pairs provides a unique direct probe of this potential, giving a key handle on many of the open questions in the Standard Model.The cross section of Di-Higgs production is about 1000 times smaller than the single Higgs production cross section. The analysis will be using data from ATLAS detector during Run2 and partial Run3. It will constrain the di-Higgs production cross-section and the self-coupling and set limits on various resonant and non-resonant new physics models. The analysis will use the events in which one of the Higgs decays into b-quark and the other into a pair of tau leptons and it will be focused on the channel in which both tau decay hadronically.