Mixed Strong--Electroweak Radiative Corrections the Production of W/Z Bosons at the LHC

混合强电弱辐射校正大型强子对撞机中 W/Z 玻色子的产生

• 批准号: 414714711
• 负责人: Professor Dr. Stefan Dittmaier
• 金额: --
• 依托单位: Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/414714711?language=en
• 关键词: Mixed; Strong; Electroweak; Radiative; Corrections

The Drell-Yan-like production of W and Z bosons is among the most important classes of particle reactions at the CERN Large Hadron Collider (LHC). As standard candle processes they are used in detector calibration, they offer high-precision measurements of the effective weak mixing angle and the W-boson mass, and finally provide a window to heavy new gauge bosons W' and Z' in high-energy tails of differential distributions. It is the aim of this proposal to calculate the next-to-next-to-leading-order corrections of mixed QCD-EW type to these processes, i.e. the ones of the order O(alpha_s alpha), which represent the largest unknown type of radiative corrections in fixed-order of perturbation theory. Beyond their direct phenomenological importance in the description of W/Z production, the results of these calculations will impact predictions for other process classes as well. On the one hand, concepts, techniques, and partial results may be taken over to other reactions; one the other, a comparison of the new full results to existing approximations will help to tune or to systematically improve the approximative combination of QCD and electroweak radiative corrections. Technically and conceptually, the challenging calculations are at the forefront of perturbative calculations for particle reactions, but widely build on existing methods such as integration-by-parts and differential equations for the calculation of massive two-loop Feyman diagrams or antenna subtraction for the treatment of infrared singularities in real-emission corrections. Nevertheless, certain aspects require generalizations and further developments of existing concepts, such as the gauge-invariant treatment of intermediate W/Z resonances via the complex-mass scheme.

W和Z玻色子的类Drell-Yan产生是CERN大型强子对撞机（LHC）中最重要的粒子反应之一。作为标准烛光过程，它们被用于探测器校准，它们提供了有效弱混合角和W玻色子质量的高精度测量，并最终提供了一个窗口，以重新的规范玻色子W'和Z'的高能量尾部的微分分布。本文的目的是计算混合QCD-EW型对这些过程的次-次-首阶修正，即O（alpha_s alpha）阶修正，它代表了固定阶微扰理论中最大的未知辐射修正类型。除了它们在描述W/Z生产中的直接现象学重要性之外，这些计算的结果也将影响其他过程类别的预测。一方面，概念、技术和部分结果可以用于其他反应;另一方面，新的完整结果与现有近似的比较将有助于调整或系统地改进QCD和电弱辐射修正的近似组合。从技术和概念上讲，这些具有挑战性的计算处于粒子反应微扰计算的最前沿，但广泛建立在现有方法的基础上，例如用于计算大质量双环费曼图的部分积分和微分方程，或用于实际发射校正中红外奇异点处理的天线减法。然而，某些方面需要推广和进一步发展现有的概念，如规范不变的治疗中间W/Z共振通过复杂的质量计划。