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<p>We represent the multi-leg tree-level amplitudes of quarks and gluons using a minimal set of lightcone variables, which incorporate all on-shell and momentum conservation conditions and naturally captures the separate longitudinal and transverse momentum components. These variables make it easy to eliminate spurious poles and consider multi-Regge kinematic limits. In this framework we examine the factorization of tree-level amplitudes in rapidity and extract all two, three and four parton Multi-Regge Emission Vertices (MREVs), both central and peripheral, and summarise them in a Mathematica library, MREV. We investigate in detail how relations between amplitudes translate into relations between MREVs. These relations, along with factorization properties in further kinematic limits, provide robust consistency checks of the results.</p>

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Regge factorization of tree-level QCD amplitudes using a minimal set of lightcone variables

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月18日

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  • Emmet P. Byrne,
  • Vittorio Del Duca,
  • Einan Gardi,
  • Yuyu Mo,
  • Jennifer M. Smillie

摘要

We represent the multi-leg tree-level amplitudes of quarks and gluons using a minimal set of lightcone variables, which incorporate all on-shell and momentum conservation conditions and naturally captures the separate longitudinal and transverse momentum components. These variables make it easy to eliminate spurious poles and consider multi-Regge kinematic limits. In this framework we examine the factorization of tree-level amplitudes in rapidity and extract all two, three and four parton Multi-Regge Emission Vertices (MREVs), both central and peripheral, and summarise them in a Mathematica library, MREV. We investigate in detail how relations between amplitudes translate into relations between MREVs. These relations, along with factorization properties in further kinematic limits, provide robust consistency checks of the results.