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arXiv 1707.01029hep-ph
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大型强子对撞机Z玻色子对产生的完全NLO电弱修正

Full NLO electroweak corrections to Z-boson pair production at the Large Hadron Collider

Benedikt Biedermann

摘要:

我们报告最近计算的完整的次领先的顺序电弱修正Z玻色子对生产与随后的衰变成四个带电轻子。在过程$pp\toμ^+μ^-e^+e^-$和$pp \toμ^+μ^-μ^+μ^-$的电弱耦合中使用首阶和次首阶的完全矩阵元,这包括了中等质量矢量玻色子和光子的所有离壳效应。我们采用规范不变分裂的电弱校正成纯粹的弱和光子校正。后者在运动学阈值或共振附近显示出众所周知的辐射尾。前者在基准截面上一般处于$\sim-5\%$水平,在分布的高能尾部由于电弱起源的扰动而达到几个$-10\%$。末态等味轻子的干扰效应在离壳层敏感区的影响可达$5\%$量级。光子诱导的贡献包括在我们的计算中,但结果是现象学上不重要的。

英文摘要:

We report on a recent calculation of the full next-to-leading-order electroweak corrections to Z-boson pair production with subsequent decays into four charged leptons. Using the complete matrix elements at leading order and next-to-leading order in the electroweak coupling for the processes $pp\toμ^+μ^-e^+e^-$ and $pp \toμ^+μ^-μ^+μ^-$, this includes all off-shell effects of intermediate massive vector bosons and photons. We employ a gauge-invariant splitting for the electroweak corrections into purely weak and photonic corrections. The latter show the well-known radiative tails near kinematical thresholds or resonances. The former are generically at the level of $\sim-5\%$ for the fiducial cross section and reach several $-10\%$ in the high-energy tails of distributions due to logarithms of electroweak origin. The impact of interference effects due to equal-flavour leptons in the final state can reach the order of $5\%$ in off-shell-sensitive regions. Photon-induced contributions are included in our calculation, but turn out to be phenomenologically unimportant.

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