Constructing massive on-shell contact terms
(2020) Journal of High Energy Physics — Vol. 12, n° 12, p. 175 (2020)
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- Authors
Kitahara, Teppei 
Machado, Camila S.
- Abstract
- The purely on-shell approach to effective field theories requires the construction of independent contact terms. Employing the little-group-covariant massive-spinor formalism, we present the first systematic derivation of independent four-point contact terms involving massive scalars, spin-1/2 fermions, and vectors. Independent three-point amplitudes are also listed for massive particles up to spin-3. We make extensive use of the simple relations between massless and massive amplitudes in this formalism. Our general results are specialized to the (broken-phase) particle content of the electroweak sector of the standard model. The (anti)symmetrization among identical particles is then accounted for. This work opens the way for the on-shell computation of massive four-point amplitudes.
- Affiliations
Citations
Durieux, G., Kitahara, T., Machado, C. S., Shadmi, Y., & Weiss, Y. (2020). Constructing massive on-shell contact terms. Journal of High Energy Physics, 12(12), 175. https://doi.org/10.1007/JHEP12(2020)175 (Original work published 2020)