Collinear and Soft Gluon Corrections in Top Quark and Higgs Processes at the LHC and the Tevatron

LHC 和 Tevatron 顶夸克和希格斯过程中的共线和软胶子校正

• 批准号: 0855421
• 负责人: Nikolaos Kidonakis
• 金额: $ 12万
• 依托单位: Kennesaw State University Research and Service Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-15 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0855421&HistoricalAwards=false
• 关键词: Collinear; Soft; Gluon; Corrections; Top

"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."Understanding and controlling the effects of QCD is crucial for performing precision tests of the standard model (SM) and detecting and identifying signals of new physics at hadron colliders. Perturbative QCD calculations are plagued by the dependence on the renormalization and factorization scales, resulting in uncertainties in the predictions of cross sections of typically O (100%) at leading order in the perturbation series in the strong coupling constant. To reduce the dependence on these arbitrary, unphysical parameters, QCD predictions need to include higher order corrections. The cross sections of the SM processes under consideration in this proposal are all known at next-to leading order (NLO) QCD (top-pair production, single top production) and next-to-next-to leading order (NNLO) QCD (Higgs production via gluon fusion). The PIs intend to further improve these calculations by including soft gluon resummation. The proposed calculations will further reduce the residual theoretical uncertainties due to the scale dependence, which is necessary in view of the envisioned experimental accuracy at the LHC. In the data analysis multi-purpose Monte Carlo (MC) generators such as Pythia and Herwig are well-used tools but providing improved predictions including higher-order corrections beyond the parton shower approach in form of a MC tool is still work in progress. The broader impacts are as follows: The proposed activities will play an important role in providing improved QCD predictions of a variety of processes in the SM and its supersymmetric extension that are crucial to fully exploit the physics potential of the LHC. Moreover, the calculational advancements in perturbative QCD developed as part of this project as well as the inclusion of soft resummation in Herwig++ will benefit the entire field of hadron collider phenomenology Dr. Kidonakis is already involving undergraduate students in his research activities. He plans to extend these activities by providing future teachers of Kennesaw's Master of Arts in Teaching program with a research experience in particle physics.

“这项奖励是根据2009年美国复苏和再投资法案（公法111-5）资助的。”理解和控制QCD效应对于进行标准模型（SM）的精确测试以及在强子对撞机上探测和识别新物理信号至关重要。微扰QCD计算受重正化和因子化尺度的依赖所困扰，导致在强耦合常数的微扰序列中，典型的0（100%）阶截面预测存在不确定性。为了减少对这些任意的非物理参数的依赖，QCD预测需要包括高阶修正。本提案中考虑的SM过程的横截面都已知为次领先订单（NLO） QCD（顶对生产，单顶生产）和次领先订单（NNLO） QCD（通过胶子融合的希格斯生产）。pi打算通过包括软胶子恢复来进一步改进这些计算。所提出的计算将进一步减少由于尺度依赖而产生的剩余理论不确定性，考虑到LHC预期的实验精度，这是必要的。在数据分析中，多用途蒙特卡罗（MC）生成器（如Pythia和Herwig）是常用的工具，但以MC工具的形式提供改进的预测，包括超越parton shower方法的高阶修正，仍在进行中。更广泛的影响如下：提议的活动将在提供SM及其超对称扩展中各种过程的改进QCD预测方面发挥重要作用，这对于充分利用LHC的物理潜力至关重要。此外，作为该项目的一部分，微扰QCD的计算进步以及Herwig++中的软恢复将使整个强子对撞机现象学领域受益。Kidonakis博士已经让本科生参与他的研究活动。他计划通过为肯尼索大学教学硕士项目的未来教师提供粒子物理学的研究经验来扩展这些活动。