Tree-level soft emission for two pairs of quarks

2024/11/13 by X. Chen, Chen, Xinguang, Zhengwen Liu +1
Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2411.08795

openalex publication_date 2024/11/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

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.

Related

• Single-soft emissions for amplitudes with two colored particles at three loops
• Triple (and quadruple) soft-gluon radiation in QCD hard scattering
• Double soft current at one-loop in QCD
• Multiparton Cwebs at five loops
• All-order colour structure and two-loop anomalous dimension of soft radiation in heavy-particle pair production at the LHC