Speaker
Description
The Standard Model (SM) has consistently provided a robust description of particle interactions, yet intriguing anomalies, particularly within the neutrino sector, suggest potential areas for further exploration. In this talk, we present a comprehensive global fit of coherent elastic neutrino-nucleus scattering (CEνNS) data from COHERENT (CsI, Ar), CONUS+, TEXONO, and neutrino-electron scattering (νES) data from TEXONO, LAMPF, LSND, BNL-E734, and CHARM-II experiments. Additionally, we incorporate complementary constraints derived from direct dark matter detection experiments such as LZ, XENONnT, and PandaX, exploiting their sensitivity to solar neutrinos.
Our analysis focuses on extracting precise measurements of the neutrino charge radius, a subtle yet critical electromagnetic property predicted by the SM. Results indicate good consistency with SM expectations, showing no significant evidence for flavor-dependent deviations beyond standard predictions. Notably, we provide stringent constraints on the tau neutrino charge radius from CEνNS and νES datasets, achieving unprecedented sensitivity.
The second part of our presentation addresses a global fit of the vector and axial-vector neutrino-electron neutral current couplings. By explicitly considering flavor dependencies and momentum-transfer corrections, we assess the electroweak theory's predictions and reveal two possible solutions: a scenario closely aligned with the SM and another degenerate solution presently favored by the data. We emphasize the importance of radiative corrections and momentum-dependence effects, highlighting their critical role in future precision measurements. Finally, we demonstrate that next-generation dark matter detectors have the potential to definitively resolve existing degeneracies, enabling an unprecedented test of the electroweak interaction in neutrino physics.
