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arXiv 2007.08867hep-ph
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有限- $p_T$ $Z$ -玻色子产生和双轻子衰变中角系数的电弱修正

Electroweak corrections to the angular coefficients in finite-$p_T$ $Z$-boson production and dilepton decay

Rikkert Frederix, Timea Vitos

摘要:

我们提出了次领先阶(NLO)电弱修正的主要五个角系数参数化的Drell-Yan过程中的$Z$玻色子质量峰值范围有限的$p_T$矢量玻色子生产。结果是在矢量玻色子横动量的差异。Lam-Tung破坏差$A_0-A_2$与系数一起被检查。在电弱修正的情况下,需要一个单一的轻子横动量切割,以避免在光子诱导图中的双奇异性,并研究了对这个切割值的依赖性。我们比较了角系数的电弱修正和非线性光学QCD修正,包括单轻子切割。发现单轻子切割的大小对两个系数$A_0$和$A_2$的影响最大。的相对大小的电弱修正系数是温和的所有单轻子削减值,并通过外推到包容性的结果,也是温和的全双轻子相空间的情况下。然而,对于Lam-Tung破坏,有一个显着的贡献,从电弱修正的低$p_T$轻子对。

英文摘要:

We present next-to-leading order (NLO) electroweak corrections to the dominant five angular coefficients parametrizing the Drell-Yan process in the $Z$-boson mass peak range for finite-$p_T$ vector boson production. The results are presented differentially in the vector boson transverse momentum. The Lam-Tung violating difference $A_0-A_2$ is examined alongside the coefficients. A single lepton transverse momentum cut is needed in the case of electroweak corrections to avoid a double singularity in the photon induced diagrams, and the dependence on the value of this cut is examined. We compare the electroweak corrections to the angular coefficients to the NLO QCD corrections, including the single lepton cut. The size of the single lepton cut is found to affect the two coefficients $A_0$ and $A_2$ to largest extent. The relative size of the electroweak corrections to the coefficients is moderate for all single lepton cut values, and by extrapolation to the inclusive results, is moderate also for the full dilepton phase space case. However, for the Lam-Tung violation, there is a significant contribution from the electroweak corrections for low $p_T$ of the lepton pair.

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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