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- W2215112339 abstract "Four-point functions are at the heart of many interesting physical processes. A prime example is the light-by-light scattering amplitude, which plays an important role in the calculation of hadronic contributions to the anomalous magnetic moment of the muon. In the calculation of such quantities one faces the challenge of finding a suitable and well-behaved basis of tensor structures in coordinate and/or momentum space. Provided all (or many) of the external legs represent similar particle content, a powerful tool to construct and organize such bases is the permutation group S4. We introduce an efficient notation for dealing with the irreducible multiplets of S4, and we highlight the merits of this treatment by exemplifying four-point functions with gauge-boson legs such as the four-gluon vertex and the light-by-light scattering amplitude. The multiplet analysis is also useful for isolating the important kinematic regions and the dynamical singularity content of such amplitudes. Our analysis serves as a basis for future efficient calculations of these and similar objects." @default.
- W2215112339 created "2016-06-24" @default.
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- W2215112339 date "2015-09-23" @default.
- W2215112339 modified "2023-10-17" @default.
- W2215112339 title "Four-point functions and the permutation group<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi>S</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>" @default.
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- W2215112339 doi "https://doi.org/10.1103/physrevd.92.056006" @default.
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