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The flavour of New Physics in the loops of hadronic beauty decays

新物理学的味道在强子之美的循环中逐渐衰退

基本信息

批准号：
EP/X014746/2
负责人：
Matthew Kenzie
金额：
$ 160.55万
依托单位：
University of Cambridge
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2023
资助国家：
英国
起止时间：
2023 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FX014746%2F2
关键词：
flavour New Physics loops hadronic

项目摘要

The Standard Model (SM) of Particle Physics, whilst incredibly successfully, is known not to provide anadequate description for various observed physical phenomena. Precision measurements in the flavoursector are an ideal laboratory to search for New Physics (NP) beyond the SM at very high energy scales.This proposal will make precise measurements of highly NP sensitive decay rate ratios and weak phases,which arise in beauty-quark to strange- or down-quark transitions, using data collected at the LargeHadron Collider beauty (LHCb) experiment.The weak phase under consideration, called phi-s, has a very small and precisely known value in the SMmaking its determination a prime avenue for exploration of NP. However, interpretation of the experimentalmeasurement, within the framework of the SM, is complicated by unknown polluting contributions. Thisissue is overcome in this proposal using a novel analysis technique, which simultaneously extracts theunknown contribution by exploiting flavour symmetries that are known to hold for the decays under study.This proposal will make the world's first precision measurement of phi-s using this analysis method.A family of seven inter-related decay modes of neutral B-mesons to hadrons, via vector-vector states, willbe investigated. Beyond extraction of the weak phase, phi-s, understanding of the complex amplitudestructure of these decays will provide insights into the role of New Physics in their decay dynamics. Thisproposal will make world's first and world's most precise measurements of various compelling decay rateparameters and phases which probe the fundamental nature of these processes.During the timeline of this proposal the available datasets will increase by a factor of forty and theproject will deliver cutting-edge developments in analysis techniques and software tools. The outcome isa step-change in the physics reach, which will permit these precision measurements to be made for thefirst time.

粒子物理学的标准模型（SM）虽然取得了令人难以置信的成功，但人们知道它不能对各种观察到的物理现象提供充分的描述。风味领域的精确测量是在非常高的能量尺度上寻找超越SM的新物理（NP）的理想实验室。该提案将使用大型强子对撞机美丽实验（LHCb）收集的数据，精确测量在美夸克到奇异夸克或下夸克转变中出现的高NP敏感衰变率比率和弱相。所考虑的弱相，称为phi-s，在smm中具有非常小且精确已知的值，使其确定成为探索NP的主要途径。然而，在SM框架内对实验测量的解释由于未知的污染贡献而变得复杂。这个问题在本提案中使用一种新的分析技术来克服，该技术同时通过利用已知的在研究中的衰变中保持的风味对称性来提取未知的贡献。这一建议将使世界上第一次使用这种分析方法精确测量phi-s。中性b介子到强子的七种相互关联的衰变模式，通过矢量-矢量态，将被研究。除了提取弱相之外，对这些衰变的复杂振幅结构的理解将为新物理学在其衰变动力学中的作用提供见解。这一提议将使世界上第一次和世界上最精确的测量各种引人注目的衰减率参数和阶段，探索这些过程的基本性质。在本提案的时间表内，可用的数据集将增加40倍，该项目将提供分析技术和软件工具的前沿发展。结果是物理范围的阶梯式变化，这将允许首次进行这些精确测量。