Search for 3rd generation SUSY particles with the ATLAS experiment at the Large Hadron Collider

在大型强子对撞机上利用 ATLAS 实验寻找第三代 SUSY 粒子

• 批准号: 2025327
• 金额: --
• 依托单位: University of Sussex
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2025327
• 关键词: Search; 3rd; generation; SUSY; particles

The ATLAS limits on the production of third generation squarks are already setting tight constraints to the existent of low fine-tuning supersymmetry configurations. However, the sensitivity to such particles is at the moment significant weaker if their mass is very similar to the sum of the masses of the particles they decay into. In this configuration, b-quarks emitted in the third generation squark decays tend to be very soft, and their identification becomes extremely challenging. The ATLAS sensitivity to such compressed scenarios can be enhanced by developing discriminants that are sensitive to the presence of additional secondary vertices in the event, regardless of whether they can be associated to jets. The aim of this project is to define this discriminant and apply it to searches of stops and sbottoms using the full ATLAS Run 2 dataset.

ATLAS对第三代方子产生的限制已经对低微调超对称性构型的存在设置了严格的限制。然而，如果这些粒子的质量与它们衰变成的粒子的质量之和非常相似，那么对这些粒子的灵敏度此时明显较弱。在这种配置中，在第三代夸克衰变中发射的b夸克往往非常柔软，它们的识别变得非常具有挑战性。ATLAS对这种压缩场景的敏感性可以通过开发对事件中存在的附加次级顶点敏感的判别式来增强，而不管它们是否可以与射流相关联。该项目的目的是定义这个判别式，并将其应用于使用完整的ATLAS Run 2数据集搜索止损和底部。