Connecting LHCb to theories of the weak scale

将 LHCb 与弱尺度理论联系起来

• 批准号: ST/H004661/1
• 负责人: Sebastian Jaeger
• 金额: $ 24.25万
• 依托单位: University of Sussex
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FH004661%2F1
• 关键词: Connecting; LHCb; theories; weak; scale

At the CERN LHC, the LHCb experiment will perform a variety of measurements that are sensitive to quantum fluctuations of new particles of TeV mass (about 10-20 times the mass of the weak bosons W and Z) . These involve so-called rare decays of B mesons and related matter-antimatter asymmetries. Particles in the TeV mass range are predicted by all major proposals addressing the origin of the weak scale (mass scale of the W and Z bosons), such as supersymmetry, 'large' extra spacetime dimensions, technicolour, and little higgs theories - generically called 'new physics'. The search for those particles is the main motivation for the LHC experiments, besides the discovery of the Higgs boson. The rare B decays are very sensitive to quantum fluctuations involving any such new particles, because for varying reasons they are strongly suppressed in the absence of new particles, i.e. in what is called the Standard Model of particle physics. (This is what makes them rare.) As such, their measurement provides a very rich source of information on the details of 'beyond-standard model' theories. Many of the LHCb measurements will be possible already in the early stages of the LHCb, when the amount of data taken (technically, 'integrated luminosity') is still small - somewhat of a headstart over the companion experiments ATLAS & CMS, which focus on direct production of new particles. The UK has a very strong experimental involvement in LHCb (one of the strongest of all countries) but comparably very few theoretical activities. To read the fingerprints of the new physics out of the data, however, requires careful theoretical analysis, to separate the 'known', but hard to calculate, 'ordinary' (Standard-Model) effects from the sought-after patterns of what lies beyond. This project involves the systematic and precise application and further development of state-of-the-art methods, based on the heavy-quark expansion for exclusive decays, to the decay modes with the greatest discovery potential: exclusive leptonic, semileptonic, radiative, and two-body hadronic B decays. Thus it provides a valuable and necessary complement to experimental activities in the UK, allowing to make the most of these measurements. As an important part of this project, its investigators will, on a regular basis, meet with experimental UK colleagues and other interested theorists to optimize cooperation and analysis strategies.

在CERN LHC，LHCb实验将进行各种测量，这些测量对TeV质量（大约是弱玻色子W和Z质量的10-20倍）的新粒子的量子涨落敏感。这包括所谓的B介子的稀有衰变和相关的物质-反物质不对称性。TeV质量范围内的粒子被所有主要的解决弱标度（W和Z玻色子的质量标度）起源的提议所预测，例如超对称性，“大”额外时空维度，技术色和小希格斯理论-统称为“新物理学”。除了发现希格斯玻色子之外，寻找这些粒子是LHC实验的主要动机。罕见的B衰变对涉及任何新粒子的量子涨落非常敏感，因为由于不同的原因，它们在没有新粒子的情况下，即在所谓的粒子物理学标准模型中被强烈抑制。(This是什么让他们罕见的）。因此，他们的测量提供了一个非常丰富的信息来源的细节“超标准模型”的理论。LHCb的许多测量在LHCb的早期阶段就已经有可能了，当时采集的数据量（技术上说，“积分光度”）仍然很小--在某种程度上领先于ATLAS和CMS的配套实验，后者专注于直接产生新粒子。英国对LHCb的实验参与非常强（所有国家中最强的国家之一），但理论活动很少。然而，要从数据中读出新物理学的指纹，需要仔细的理论分析，将“已知的”，但难以计算的“普通”（标准模型）效应与超越的追求模式分开。该项目涉及系统和精确的应用和进一步发展的国家的最先进的方法，基于重夸克扩展的独家衰变，以最大的发现潜力的衰变模式：独家轻子，半轻子，辐射和两体强子B衰变。因此，它提供了一个宝贵的和必要的补充，在英国的实验活动，使这些测量的最。作为该项目的重要组成部分，其研究人员将定期与英国实验同事和其他感兴趣的理论家会面，以优化合作和分析策略。

项目成果

On the strangeness content of the nucleon

• 发表时间: 2012-09
• 作者: J. M. Alarcón;L. Geng;J. Camalich;J. A. Oller

Relativistic chiral representation of the \pi N scattering amplitude

pi N 散射幅度的相对论手征表示

• 发表时间: 2011
• 作者: Alarcon, J.M.;Martin Camalich, J.;Oller, J.A.;Alvarez-Ruso, L.
• 通讯作者: Alvarez-Ruso, L.

Relativistic chiral representation of the $\pi N$ scattering amplitude I: The Goldberger-Treiman relation

$pi N$ 散射幅度 I 的相对论手征表示：Goldberger-Treiman 关系

• 发表时间: 2012
• 期刊: Prog.Part.Nucl.Phys.
• 作者: Alarcon, J.M.;Martin Camalich, J.;Oller, J.A.
• 通讯作者: Oller, J.A.

The strangeness content of the nucleon from effective field theory and phenomenology

• DOI: 10.1016/j.physletb.2014.01.065
• 发表时间: 2012-09
• 期刊: arXiv: High Energy Physics - Phenomenology
• 作者: J. M. Alarcón;L. Geng;J. Camalich;J. A. Oller

Low energy analysis of $\pi N$ scattering and the pion-nucleon sigma term with covariant baryon chiral perturbation theory

• 发表时间: 2013-01
• 期刊: arXiv: High Energy Physics - Phenomenology
• 作者: J. M. Alarc'on;J. Camalich;J. A. Oller