Papers › Spinning Partial Waves for Scattering Amplitudes in d Dimensions
Spinning Partial Waves for Scattering Amplitudes in d Dimensions
Ilija Buric, Francesco Russo, Alessandro Vichi
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Partial wave decomposition is one of the main tools within the modern S-matrix studies. We present a method to compute partial waves for 2→2 scattering of spinning particles in arbitrary spacetime dimension. We identify partial waves as matrix elements of the rotation group with definite covariance properties under a subgroup. This allows to use a variety of techniques from harmonic analysis in order to construct a novel algebra of weight-shifting operators. All spinning partial waves are generated by the action of these operators on a set of known scalar seeds. The text is accompanied by a {\it Mathematica} notebook to automatically generate partial waves. These results pave the way to a systematic studies of spinning S-matrix bootstrap and positivity bounds.
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