2013/01/31 by Bo Feng, Honghui Wang
Mathematics · Physics and Astronomy · #Algebraic and Geometric Analysis #Black Holes and Theoretical Physics #Quantum and Classical Electrodynamics #hep-ph #hep-th
paper · pdf · doi:10.1007/jhep05(2013)104
published as JHEP05(2013)104 · 40 pages. Some discussions and references updated
openalex publication_date 2013/05/01 · arxiv created 2013/05/27 · arxiv updated 2013/05/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
By the unitarity cut method, analytic expressions of one-loop coefficients have been given in spinor forms. In this paper, we present one-loop coefficients of various bases in Lorentz-invariant contraction forms of external momenta. Using these forms, the analytic structure of these coefficients becomes manifest. Firstly, coefficients of bases contain only second-type singularities while the first-type singularities are included inside scalar bases. Secondly, the highest degree of each singularity is correlated with the degree of the inner momentum in the numerator. Thirdly, the same singularities will appear in different coefficients, thus our explicit results could be used to provide a clear physical picture under various limits (such as soft or collinear limits) when combining contributions from all bases.