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arXiv 1704.01031hep-ph
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QCD对Higgs物理的辐射修正

QCD Radiative Corrections to Higgs Physics

Taushif Ahmed

摘要:

本论文的中心部分研究了与Drell-Yan、标量和赝标量希格斯玻色子产生相关的几个重要观测量的量子色动力学辐射修正,旨在提高理论结果的准确性。希格斯玻色子主要是在大型强子对撞机(LHC)上通过顶夸克环的胶子融合产生的,而次主导的一种是通过底夸克湮灭产生的,其贡献同样重要,必须包括在精确的研究中。在这里,我们分析计算了包含截面的希格斯玻色子通过这个通道下的软虚(SV)近似下在N $^{3}$ LO QCD以下的优雅的形式主义。此外,微分快度分布是另一个最重要的观测数据,预计将在未来几天在LHC进行测量。这就需要非常精确的理论预测。计算了在N $^{3}$ LO处,胶子聚变产生的希格斯玻色子和Drell-Yan(DY)产生的轻子对的SV修正的解析表达式,并证明了这些结果的数值影响.此外,在考虑QCD辐射修正的情况下,详细研究了BSM方案中最主要的候选粒子之一CP奇/赝标量希格斯玻色子玻色子.本文计算了赝标希格斯玻色子产生的三圈QCD修正的解析结果,从而得到了SV近似下N $^{3}$ LO的包含产生截面.这些确实有助于减少由重整化和因子化标度引起的理论不确定性,毫无疑问,提高了理论结果的可靠性。

英文摘要:

The central part of this thesis deals with the quantum chromodynamics (QCD) radiative corrections to some important observables associated with the Drell-Yan, scalar and pseudo-scalar Higgs boson productions at next-to-next-to-next-to-leading order (N$^{3}$LO) aiming to uplift the accuracy of theoretical results. The Higgs bosons are produced dominantly at the Large Hadron Collider (LHC) via gluon fusion through top quark loop, while one of the subdominant ones takes place through bottom quark annihilation whose contribution is equally important and must be included in precision studies. Here, we have computed analytically the inclusive cross section of the Higgs boson produced through this channel under the soft-virtual (SV) approximation at N$^{3}$LO QCD following an elegant formalism. Moreover, the differential rapidity distribution is another most important observable, which is expected to be measured in upcoming days at the LHC. This immediately calls for very precise theoretical predictions. The analytical expressions of the SV corrections to this observable at N$^{3}$LO for the Higgs boson, produced through gluon fusion, and leptonic pair in Drell-Yan (DY) production are computed and the numerical impacts of these results are demonstrated. In addition, the CP-odd/pseudo-scalar Higgs boson, which is one of the most prime candidates in BSM scenarios, is studied in great details, taking into account the QCD radiative corrections. We have computed the analytical results of the three loop QCD corrections to the pseudo-scalar Higgs boson production and consequently, obtained the inclusive production cross section at N$^{3}$LO under SV approximation. These indeed help to reduce the theoretical uncertainties arising from the renormalisation and factorisation scales and undoubtedly, improve the reliabilities of the theoretical results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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