Speaker
Description
Neutrino-electron scattering provides a clean tool constraining the neutrino flux at accelerator-based neutrino facilities and requires precise theoretical predictions. We determine the effective theory of neutrino-electron and neutrino-quark scattering and provide the most precise up-to-date prediction for neutrino-electron scattering cross sections quantifying errors for the first time to be of order $0.2-0.4~\%$. Radiative corrections in the theory with electron and neutrinos can be determined from three effective couplings as an input. One is the Fermi constant which is known with sub-ppm accuracy. Another one has a small error of order $0.02~\%$. The uncertainty of the third one is limited by the knowledge of hadronic contributions to charge-isospin vector-vector correlation function. We also discuss tests of the Standard Model exploiting inputs at different scales and provide the most precise neutrino-electron and neutrino-quark couplings. The latter can be useful for evaluating the Standard Model processes and constraining new physics scenarios.
