ALPs, the on-shell way

Autor(es)

Bertuzzo, Enrico ; Grojean, Christophe ; Salla, Gabriel M.

• Tipo de documento: Artigo Científico
• Fonte: Journal of High Energy Physics; v. N/A, n. 5, p. 43-pg., 2024-05-15.

Resumo

We study how the coupling between axion-like particles (ALPs) and matter can be obtained at the level of on-shell scattering amplitudes. We identify three conditions that allow us to compute amplitudes that correspond to shift-symmetric Lagrangians, at the level of operators with dimension 5 or higher, and we discuss how they relate and extend the Adler's zero condition. These conditions are necessary to reduce the number of coefficients consistent with the little-group scaling to the one expected from the Lagrangian approach. We also show how our formalism easily explains that the dimension-5 interaction involving one ALP and two massless spin-1 bosons receive corrections from higher order operators only when the ALP has a non-vanishing mass. As a direct application of our results, we perform a phenomenological study of the inelastic scattering & ell; + & ell; - -> phi h (with & ell; +/- two charged leptons, phi the ALP and h the Higgs boson) for which, as a result of the structure of the 3-point and 4-point amplitudes, dimension-7 operators can dominate over the dimension-5 ones well before the energy reaches the cutoff of the theory. (AU)

• Processo FAPESP: 20/14713-2 - Aspectos da conexão neutrino-matéria escura
• Beneficiário: Gabriel Massoni Salla
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 19/04837-9 - Fenomenologia de partículas
• Beneficiário: Gustavo Alberto Burdman
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 22/07360-1 - Bósons de Nambu-Goldstone sob uma perspectiva on-shell
• Beneficiário: Gabriel Massoni Salla
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado