Calculation of higher order corrections for TeV colliders

TeV 对撞机高阶修正的计算

• 批准号: PP/D00621X/2
• 负责人: Gudrun Heinrich
• 金额: $ 38.81万
• 依托单位: Durham University
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=PP%2FD00621X%2F2
• 关键词: Calculation; higher; order; corrections; TeV

Our current understanding about the constituents of matter is summarized in the so-called Standard Model (SM) of Elementary Particle Physics. This model has been established and tested over the past decades at several high energy particle colliders around the world. However, one ingredient of this model, the Higgs boson, is still missing. Further, there are theoretical reasons to believe that the SM is only an effective theory at low energies of a more fundamental underlying theory behind. Candidates for such theories are supersymmetry, supergravity or string theories/theories with more than four space-time dimensions. To find the Higgs boson and to find out about a more fundamental theory, particle collisions at higher energies than in past experiments have to be investigated. To this aim, a Large Hadron Collider (LHC) is built at CERN (Geneva) where two protons are lead to collision, each having an energy which will be sufficient to produce Higgs bosons if the Standard Model assumptions are right. However, in order to extract such Higgs production events (called 'signals') from the huge amount of 'uninteresting' collisions (called 'background'), precise calculations and simulations of the signal as well as the background events are necessary. Such calculations are subject of the proposed research. In order to achieve the required precision and to simulate the experimental environment as close as possible, so-called 'radiative corrections' have to be calculated. Some techniques for such calculations already have been established over the last years, but only for a very limited class of processes, i.e. processes where only few particles in the final state are detected. For multi-particle production, the calculations are quite involved and require the development of new methods, largely based on powerful computer resources. Further, an international electron-positron Linear Collider is planned where measurements of an unseen precision at very high energy can be performed in order to learn more about the properties of the new particles which should be discovered at the LHC and to find particles which could not be detected so far.. In order to make theoretical predictions with a precision needed for such a machine, the calculation of radiative corrections has to be pushed even further. The proposed project will lead to a very precise theoretical prediction for a process where three so-called 'jets' are produced, which are clusters of particles bound together by strong interactions. This calculation will enable the measurement of the strong coupling constant with an unprecedented precision and also open the door to high precision predictions for other processes. In summary, the project aims at the construction of highly automated programs in order to make precise theoretical predictions for the wealth of data which will be produced at future high energy colliders.

我们目前对物质构成的理解总结在所谓的基本粒子物理学标准模型（SM）中。过去几十年来，该模型已在世界各地的多个高能粒子对撞机上建立并进行了测试。然而，这个模型的一个组成部分——希格斯玻色子——仍然缺失。此外，有理论理由相信 SM 只是背后更基本的基础理论的低能量有效理论。此类理论的候选者是超对称性、超引力或弦理论/具有四个以上时空维度的理论。为了找到希格斯玻色子并找出更基本的理论，必须研究比过去实验更高能量的粒子碰撞。为了实现这一目标，欧洲核子研究组织（日内瓦）建造了一台大型强子对撞机（LHC），其中两个质子发生碰撞，如果标准模型假设正确，每个质子都具有足以产生希格斯玻色子的能量。然而，为了从大量“无趣”碰撞（称为“背景”）中提取此类希格斯产生事件（称为“信号”），需要对信号以及背景事件进行精确计算和模拟。此类计算是拟议研究的主题。为了达到所需的精度并尽可能接近地模拟实验环境，必须计算所谓的“辐射校正”。过去几年已经建立了一些用于此类计算的技术，但仅适用于非常有限的一类过程，即仅检测到最终状态的少量粒子的过程。对于多粒子生产，计算相当复杂，需要开发新方法，很大程度上基于强大的计算机资源。此外，还计划建造一台国际正负电子直线对撞机，可以在非常高的能量下进行看不见的精度测量，以便更多地了解大型强子对撞机中应该发现的新粒子的特性，并找到迄今为止无法检测到的粒子。为了以这种机器所需的精度进行理论预测，必须进一步推动辐射校正的计算。该项目将对产生三个所谓“射流”的过程进行非常精确的理论预测，“射流”是通过强相互作用结合在一起的粒子簇。该计算将以前所未有的精度测量强耦合常数，并为其他过程的高精度预测打开大门。总之，该项目旨在构建高度自动化的程序，以便对未来高能对撞机将产生的大量数据做出精确的理论预测。

项目成果

Matching NLLA+NNLO for event shape distributions

匹配 NLLA NNLO 以获得事件形状分布

• DOI: 10.1016/j.physletb.2008.05.023
• 发表时间: 2008
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: Gehrmann T

A proposal for a standard interface between Monte Carlo tools and one-loop programs

关于蒙特卡罗工具和单循环程序之间标准接口的提案

• DOI: 10.1016/j.cpc.2010.05.016
• 发表时间: 2010
• 期刊: Computer Physics Communications
• 影响因子: 6.3
• 作者: Binoth T

Master integrals for fermionic contributions to massless three-loop form factors

费米子对无质量三环形状因数贡献的主积分

• DOI: 10.1016/j.physletb.2008.03.028
• 发表时间: 2008
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: Heinrich G

Photon-jet correlations and constraints on fragmentation functions

• DOI: 10.1103/physrevd.79.114024
• 发表时间: 2009-03
• 期刊: Physical Review D
• 影响因子: 5
• 作者: Z. Belghobsi;M. Fontannaz;J. Guillet;G. Heinrich;E.Pilon;M. Werlen

Nine-propagator master integrals for massless three-loop form factors

无质量三环形状因数的九传播器主积分

• DOI: 10.1016/j.physletb.2009.06.038
• 发表时间: 2009
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: Heinrich G