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Fermi Level Dynamics

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Updated: May 24, 2026

Setting Limits on Supersymmetry Using Simplified Models
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Published on: November 15, 2013

Bootstrapping Six-Gluon QCD Amplitudes.

Sérgio Carrôlo1, Dmitry Chicherin2, Johannes Henn1

  • 1Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, Boltzmannstrasse 8, 85748 Garching, Germany.

Physical Review Letters
|May 22, 2026
PubMed
Summary
This summary is machine-generated.

Researchers constructed the two-loop six-gluon scattering amplitude in quantum chromodynamics (QCD). This breakthrough reveals a simpler underlying structure and provides new insights into physical limits.

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Last Updated: May 24, 2026

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Area of Science:

  • High-energy physics
  • Quantum Chromodynamics (QCD)
  • Scattering amplitudes

Background:

  • Understanding scattering amplitudes in quantum chromodynamics (QCD) is crucial for high-energy physics.
  • Previous studies have focused on simpler configurations, leaving complex amplitudes less understood.

Purpose of the Study:

  • To construct the symbol-level, two-loop six-gluon scattering amplitude in QCD for the --++++ helicity configuration.
  • To identify the key components and underlying structure of these complex amplitudes.
  • To explore the implications for physical limits and function space.

Main Methods:

  • Symbol-level bootstrap construction.
  • Incorporation of leading singularities from on-shell diagram analysis.
  • Application of constraints from physical limits.

Main Results:

  • The first concrete characterization of two-loop six-gluon amplitudes at symbol level and highest weight.
  • Identification of a reduced effective function space with 137 symbol letters, fewer than the possible 167.
  • Manifestly conformally invariant expressions clarifying previous five-particle results.

Conclusions:

  • Constraints from physical limits are sufficient to determine the amplitude.
  • The reduced symbol space suggests an underlying structure similar to maximally supersymmetric Yang-Mills theory.
  • New symbol-level results for triple collinear and double soft limits were extracted.