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Progress in One-Loop QCD Computations
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We review progress in calculating one-loop scattering amplitudes required for next-to-leading-order corrections to QCD processes. The underlying technical developments include the spinor helicity formalism, color decompositions, supersymmetry, string theory, factorization and unitarity. We provide explicit examples illustrating these techniques.
Forward citations
Cited by 9 Pith papers
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Kerr Soft Dressing and the $w_{1+\infty}$ Frame Algebra at Null Infinity
The Kerr soft exponent generates a parity-alternating hierarchy of null-infinity frame generators—displacement memory at s=0, spin memory at s=1, and higher moments alternating by Kerr multipole parity—realized as the...
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Walking Sudakov: From Cusp to Octagon
In a novel scaling limit on the Coulomb branch of planar N=4 SYM, the Sudakov form factor and four-point amplitude exhibit double-logarithmic behavior governed by a walking anomalous dimension that interpolates betwee...
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QCD Scattering Amplitudes and Prescriptive Unitarity
The maximally-transcendental part of planar two-loop six-gluon MHV QCD amplitudes is bootstrapped at symbol level and expressed in a 137-letter alphabet.
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Massive Helicity-Chirality Spinor Formalism from Massless Amplitudes with On-shell Mass Insertion
A new helicity-chirality spinor basis with a 'transversality' charge claims a one-to-one UV-IR correspondence between massive amplitudes and massless amplitudes with Higgs insertions, and reproduces pion decay, top de...
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Tree and $1$-loop fundamental BCJ relations from soft theorems
Derives the fundamental BCJ relation at tree level from soft theorems in bi-adjoint scalar theory, generalizes it to 1-loop integrands, and uses it to explain Adler zeros in other scalar theories.
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Gravity loop integrands from the ultraviolet
Four-dimensional N=8 supergravity loop integrands scale one power better at infinity than general-D power-counting predicts, and this homogeneous scaling combined with BCFW behavior uniquely fixes the integrand throug...
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Relativistic Particle on Light-Front
A front-form construction with a reference null vector makes the massive-to-massless Wigner classification continuous and derives the massless spin-1 polarization shift coefficient from the angle between reference vectors.
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Extended Poincare Symmetry Dictates Massive Scattering Amplitudes
A new U(1) 'transversality' symmetry, embedded in SO(5,1), fixes the structure of massive three-point amplitudes and resolves the e+e- to mu+mu- discrepancy in the spinor-helicity formalism.
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Transmutation operators and expansions for $1$-loop Feynman integrands
New differential operators transmute 1-loop gravitational integrands to Yang-Mills ones and enable a unified web of expansions relating integrands of gravity, gauge, scalar and effective theories.
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