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<p>We compute the tree-level current for the emission of two soft quark-antiquark pairs in a hard scattering. We also compute the square of this current and discuss the resulting color correlations, featuring dipole correlations and three-parton correlations. This object is essential for analyzing the infrared singularities at next-to-next-to-next-to-next-to-leading-order (N<sup>4</sup>LO) predictions in perturbative QCD.</p>

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Tree-level soft emission for two pairs of quarks

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月25日

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  • Xinguang Chen,
  • Zhengwen Liu

摘要

We compute the tree-level current for the emission of two soft quark-antiquark pairs in a hard scattering. We also compute the square of this current and discuss the resulting color correlations, featuring dipole correlations and three-parton correlations. This object is essential for analyzing the infrared singularities at next-to-next-to-next-to-next-to-leading-order (N4LO) predictions in perturbative QCD.