Global QCD Analysis and Precision Electroweak Physics in High Energy Collider Phenomenology

高能对撞机现象学中的全局 QCD 分析和精密电弱物理

• 批准号: 1417326
• 负责人: Chien-Peng Yuan
• 金额: $ 72万
• 依托单位: Michigan State University
• 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: 2014-07-01 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1417326&HistoricalAwards=false
• 关键词: Global; QCD; Analysis; Precision; Electroweak

This award funds the research activities of Professors Jon Pumplin, Daniel Stump and C.-P. Yuan at the Michigan State University (MSU).Support for this project will contribute to understanding the fundamental nature of the physical universe--the particles that comprise it and their interactions--as revealed by experiments in high energy physics. Current understanding of high energy physics is embodied in the Standard Model (SM). Protons and neutrons, and all other strongly interacting particles, are composed of fundamental particles called partons (quarks and gluons). Interactions between the partons are described by the theory of Quantum Chromodynamics (QCD). The proposed research involves the interplay between QCD theory and experimental data from many experiments, including recent experiments at the CERN Large Hadron Collider (LHC). This global analysis of data is necessary to deepen the understanding of QCD, and to determine the probability distributions of the partons in the proton. By understanding these distributions, it is possible to take interactions of protons with protons (which is what happens at the LHC) and determine the underlying quark-quark, quark-gluon and gluon-gluon interactions. This is essential for determining the underlying physics of the process, and was necessary for extracting, for example, the Higgs boson signal. These probability distributions are called "CTEQ Parton Distribution Functions", where CTEQ means "Coordinated Theoretical-Experiment Project of QCD". The project trains graduate students and postdoctoral fellows in theoretical high energy physics at MSU and at CTEQ summer schools. It also provides opportunities for undergraduate students to participate in forefront research through the REU program, and for high school teachers and middle school students to experience physics through summer programs sponsored by MSU and the State of Michigan.As noted, the resulting CTEQ Parton Distribution Functions have been essential to the interpretation of experiments at the world's leading high energy collider facilities: Fermilab (Batavia, IL), RHIC (Brookhaven, NY), DESY (Hamburg, Germany), and CERN (Geneva, Switzerland). Although the colliders at Fermilab and DESY have been turned off, data from those facilities are still important; in particular, final data from HERA run II are still to be incorporated in the present analysis when they become available. The proposed research will continue the PIs' world-leading contributions to lepton-hadron and hadron-hadron collider phenomenology. Complementary to the research on QCD, the group will also study the Electroweak (EW) sector of the SM, which is extremely successful in explaining and predicting experimental data spanning a range in energy from the atomic scale to the Z boson and top quark masses. Measurements of W, Z, top quark pair, single top quark and Higgs boson productions at the LHC, including both inclusive rates and relevant kinematical distributions, will provide major new input to the understanding of parton distributions during the next few years. At the same time, refinements of the parton distributions are necessary for progress in the EW sector, both for testing the SM in greater precision and for probing New Physics effects in high energy colliders.

该奖项为教授乔恩·庞普林（Jon Pumplin），丹尼尔·斯坦普（Daniel Stump）和C.-P.教授的研究活动提供资金。密歇根州立大学（MSU）的元。该项目的支持将有助于理解物理宇宙的基本性质 - 构成其及其相互作用的粒子 - 高能量物理学中的实验所揭示。当前对高能量物理学的理解体现在标准模型（SM）中。质子和中子，以及所有其他强烈相互作用的颗粒，由称为parton的基本颗粒（夸克和胶子）组成。参与量之间的相互作用是通过量子染色体动力学理论（QCD）描述的。提出的研究涉及QCD理论与许多实验的实验数据之间的相互作用，包括最近在CERN大型强子撞机（LHC）的实验。对于加深对QCD的理解并确定质子中parton的概率分布是必要的。 通过理解这些分布，可以将质子与质子的相互作用（这是LHC上发生的情况）进行相互作用，并确定基础的夸克Quark，Quark-Gluon和Gluon-Gluon相互作用。 这对于确定过程的基本物理学至关重要，并且对于提取Higgs玻色子信号是必不可少的。 这些概率分布称为“ CTEQ Parton分布函数”，其中CTEQ的意思是“协调的QCD理论实验项目”。 该项目在MSU和CTEQ Summer Schools的理论高能物理学中训练研究生和博士后研究员。它还为本科生提供了通过REU计划参加前列研究的机会，而高中教师和中学生可以通过MSU和密歇根州赞助的夏季计划来体验物理学。纽约），德西（德国汉堡）和塞恩（瑞士日内瓦）。 尽管Fermilab和Desy的围墙已关闭，但这些设施的数据仍然很重要。特别是，HERA Run II的最终数据在可用时仍将纳入本分析中。拟议的研究将继续PIS对Lepton-Hadron和Handron-Hadron对撞机现象学的世界领先贡献。该小组对QCD的研究互补，还将研究SM的Electroweak（EW）领域，该扇区在解释和预测实验数据范围跨越了从原子量表到Z Boson到Z Boson和Top Quark质量的实验数据非常成功。 W，Z，顶级夸克对，单顶夸克和Higgs Boson Productions的测量，包括包容率和相关的运动学分布，将为接下来的几年提供对Parton分布的理解的重大新投入。同时，Parton分布的改进对于EW部门的进展是必要的，既要精确地测试SM，又要探测高能量煤层的新物理效应。