Constraints on Non-Commutative Physics Scale with Neutrino-Electron Scattering

Abstract

Neutrino-electron scatterings ($\hat{I}½-e$) are purely leptonic processes with robust Standard Model (SM) predictions. Their measurements can therefore provide constraints to physics beyond SM. Non-commutative (NC) field theories modify space-time commutation relations, and allow neutrino electromagnetic couplings at the tree level. Their contribution to neutrino-electron scattering cross-section was derived. Constraints were placed on the NC scale parameter $\hat{I}{›}_{NC}$ from $\hat{I}½-e$ experiments with reactor and accelerator neutrinos. The most stringent limit of $\hat{I}{›}_{NC}>3.3TeV$ at 95% confidence level improves over the direct bounds from collider experiments.

6 pages, 2 figures, 2 tables, V2: minor revisions to match published version