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arXiv 1708.04093hep-ph
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NNLL + NNLO精度下正负电子正电子湮没的能量-能量关联

Energy-energy correlation in electron-positron annihilation at NNLL+NNLO accuracy

Zoltán Tulipánt, Adam Kardos, Gábor Somogyi

摘要:

我们给出了在次-前导级的对数精度下计算$e^+e^-$碰撞中背靠背区域的能量-能量关联。我们研究了固定的高阶修正的效果,我们的结果比较LEP和SLC数据。次-前导阶校正对$α_{\mathrm S}(M_Z)$的提取值具有相当大的影响,因此其包含对于使用能量-能量相关性的强耦合的精确测量是强制性的。

英文摘要:

We present the computation of energy-energy correlation in $e^+e^-$ collisions in the back-to-back region at next-to-next-to-leading logarithmic accuracy matched with the next-to-next-to-leading order perturbative prediction. We study the effect of the fixed higher order corrections in a comparison of our results to LEP and SLC data. The next-to-next-to-leading order correction has a sizable impact on the extracted value of $α_{\mathrm S}(M_Z)$, hence its inclusion is mandatory for a precise measurement of the strong coupling using energy-energy correlation.

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