Flavor Phenomenology with Third Generation Quarks and Leptons

第三代夸克和轻子的风味现象学

• 批准号: 1414345
• 负责人: Alakabha Datta
• 金额: $ 10.5万
• 依托单位: University of Mississippi
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-07-15 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1414345&HistoricalAwards=false
• 关键词: Flavor; Phenomenology; Third; Generation; Quarks

The award funds the research activities of Alakabha Datta at the University of Mississippi. It is known that there are six quarks and six leptons forming the fundamental particles in Nature. The quarks are composed of three "flavors" with charge +2/3 (up, charm, top) and three with charge -1/3 (down, strange, bottom). These particles all mix together in the weak interaction - for example, the particle that interacts weakly with the up quark is a combination of down, strange and bottom quarks. The mixing angles and masses have all been measured precisely, but the values of the masses and mixing are completely mysterious. This is called the "flavor puzzle". Precision studies of some quarks and leptons, the bottom and top quark, and the tau lepton, are very, very sensitive to new physics beyond the standard model. So very precise studies of the interactions of these objects can lead to understanding new physics. That in turn can lead to expected signatures at the Large Hadron Collider (LHC). The proposed project will be to explore clean ways to look for physics beyond the Standard Model in the flavor sector and to find the structure of the new physics. With the historic discovery of a new particle, the Higgs boson, by the LHC it is expected that many new particles will be found at the LHC in the near future. Information on the couplings and other properties of these particles can be obtained from measurements in the flavor sector. It is also likely that many new particles may be beyond the reach of the LHC in which case information on these particles can be indirectly obtained from flavor physics. The educational activities will involve training of graduate students. An effort will be made to inform the general public and underrepresented groups in science about the relevance and importance of quantum mechanics and particle physics research via talks. There will be efforts to involve undergraduate and high school students in mini projects connected to the PI's research.The aim of the project will be to look for new physics in various flavor sectors that include the b quark sector, the top quark sector and the tau neutrino and tau lepton sectors. The proposed research activities of the project will focus on the decays of the b quark that offer excellent probes of new physics that may or may not be within reach of the LHC. In particular b decays may offer clues to possible flavor changing interactions of the newly discovered Higgs boson at the LHC. The project will study the properties of new physics in b decays with special emphasis on B -- VV decays where V is a vector meson, in decays mediated by the quark level transition b -- s l^+l^- where l is a charged lepton and in the semileptonic decays b -- c({u})tau nu_tau decays.The project will probe the effects of new physics in top production and decays via CP violating observables. Finally, this project plans to look for new physics in the third generation lepton sector. The proposal will explore methods for finding and constraining non standard neutrino interactions (NSI) from neutrino oscillation and neutrino scattering data, specially involving the nu_tau and tau leptons. An important input in this investigation will be to properly take into account hadronic effects in obtaining bounds on NSI interactions. This is a theory project and various tools employed by theoretical particle physicists will be used in the project, such as mathematical calculations, numerical analysis, numerical simulation, and data fitting.

该奖项为密西西比大学的阿拉卡巴·达塔（Alakabha Datta）的研究活动提供了资金。众所周知，在自然界中有六个夸克和六个lept子形成基本颗粒。 夸克由三个“口味”组成，带电+2/3（向上，魅力，顶部）和三个带电荷-1/3（向下，奇怪，底部）组成。 这些粒子都在弱相互作用中混合在一起 - 例如，与上夸克弱相互作用的粒子是向下，奇怪和底部夸克的组合。 混合角度和质量都经过精确测量，但是质量和混合的值完全神秘。 这称为“风味难题”。 对某些夸克和叶子，底部和顶部夸克和Tau Lepton的精确研究非常非常敏感到标准模型之外的新物理。 因此，非常精确的研究这些对象的相互作用可能会导致理解新的物理学。 反过来，这可能会导致大型强子对撞机（LHC）的预期签名。 拟议的项目将是探索干净的方法，以寻找风味部门中标准模型以外的物理学，并找到新物理的结构。随着新粒子Higgs Boson的历史性发现，LHC可以预期在不久的将来会在LHC上找到许多新粒子。这些颗粒的耦合和其他特性的信息可以从风味部门的测量中获得。也可能会间接从风味物理学中间接获得许多新粒子，在这种情况下，可能会超出LHC的范围。 教育活动将涉及研究生的培训。将努力通过演讲将量子力学和粒子物理学研究的相关性和重要性告知公众和代表性不足的群体。将努力使本科生和高中生参与与PI研究相关的迷你项目。该项目的目的是在包括B夸克部门，顶级夸克部门以及Tau Neutrino和Tau Neutrino和Tau Lepton领域的各种风味领域寻找新物理学。该项目的拟议研究活动将集中在B夸克的衰减上，这些腐烂提供了对LHC可能不在的新物理学的出色探针。特别是B衰减可能会为LHC新发现的希格斯玻色子的风味相互作用提供线索。 The project will study the properties of new physics in b decays with special emphasis on B -- VV decays where V is a vector meson, in decays mediated by the quark level transition b -- s l^+l^- where l is a charged lepton and in the semileptonic decays b -- c({u})tau nu_tau decays.The project will probe the effects of new physics in top production and decays via CP违反可观察的物品。最后，该项目计划在第三代Lepton领域寻找新物理。该提案将探讨从中微子振荡和中微子散射数据中查找和约束非标准中微子相互作用（NSI）的方法，特别涉及NU_TAU和TAU瘦素。 本研究中的一个重要输入将是正确考虑在获得NSI相互作用界限的情况下进行的HADRONIC效应。这是一个理论项目，理论粒子物理学家采用的各种工具将在项目中使用，例如数学计算，数值分析，数值模拟和数据拟合。