May 31, 2021 to June 4, 2021
Europe/Madrid timezone

An on-shell perspective on neutrino oscillations and non-standard interactions

Jun 1, 2021, 3:30 PM


PhD forum talk + poster PhD Forum


Gabriel Massoni Salla (Sao Paulo University)


We apply on-shell amplitude techniques to the study of neutrino oscillations in vacuum, focussing on processes involving W bosons. We start by determining the 3-point amplitude involving one neutrino, one charged lepton and one W boson, highlighting all the allowed kinematic structures. The result we obtain contains terms generated at all orders in an expansion in the cutoff scale of the theory, and we explicitly determine the lower dimensional operators behind the generation of the different structures. We then use this amplitude to construct the 4-point amplitude in which neutrinos are exchanged in the s-channel, giving rise to oscillations. We also study in detail how flavor enters in the amplitudes, and how the PMNS matrix emerges from the on-shell perspective.

arXiv number (if applicable) 2103.16362

Primary authors

Gabriel Massoni Salla (Sao Paulo University) Gustavo Figueiredo Severiano Alves (Universidade de Sao Paulo (BR)) enrico bertuzzo (Scuola Normale Superiore)

Presentation materials