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A new insight on dark matter at the Large Hadron Collider

大型强子对撞机对暗物质的新见解

基本信息

批准号：
2488814
负责人：
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：
2020
资助国家：
英国
起止时间：
2020 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2488814
关键词：
new insight dark matter Large

项目摘要

"What is dark matter made of?" is the big question of our times in particle physics. Five times more abundant than ordinary matter, the elusive dark matter has shaped the cosmological evolution of our universe.Many theoretical frameworks state that dark matter is made of new particles that interact only through electroweak interaction with ordinary matter. The Large Hadron Collider at CERN is the only existing machine that may be able to produce such particles in high-energy proton-proton collisions: this is a unique chance to discover, and possibly study, dark matter in controlled, reproducible conditions.A Higgs boson-like particle might play a crucial role as mediator of dark matter production. Their large Yukawa couplings make the study of candidate events where third generation quarks are produced in association with dark matter interesting. Scenarios where the associated bottom or top quarks are produced with low transverse momentum are theoretically compelling and not well studied yet.Low transverse momentum bottom quarks (possibly from top decay) are tricky to identify, as they do not necessarily yield a hadronic jet in the final state. However, they still feature the presence of a displaced decay vertex. I will select such events with a multivariate analysis exploiting innovative low transverse momentum bottom quark tagging techniques on top of information about the event kinematics. These events have never been investigated in the past: their study will bring valuable new information to the quest for dark matter search.

“暗物质是由什么构成的？是我们这个时代粒子物理学的大问题暗物质的丰度是普通物质的五倍，难以捉摸的暗物质塑造了我们宇宙的宇宙学演化。许多理论框架指出，暗物质是由新粒子组成的，这些新粒子只能通过与普通物质的电弱相互作用相互作用。欧洲核子研究中心（CERN）的大型强子对撞机是唯一一台能够在高能质子-质子碰撞中产生这种粒子的现有机器：这是一个独特的机会，可以在可控的、可重复的条件下发现并研究暗物质。他们的大汤川耦合的候选事件，第三代夸克产生与暗物质有趣的研究。低横动量底夸克或顶夸克的产生在理论上是很有说服力的，但还没有得到很好的研究。低横动量底夸克（可能来自顶衰变）很难识别，因为它们不一定会在末态产生强子喷注。然而，它们仍然以存在移位的衰减顶点为特征。我将在有关事件运动学的信息的基础上，利用创新的低横向动量底夸克标记技术，通过多元分析来选择此类事件。这些事件在过去从未被调查过：他们的研究将为寻找暗物质带来有价值的新信息。