Description
Precision measurements of neutrino oscillations at DUNE are limited by systematic uncertainties associated with neutrino--nucleus interaction modelling. The DUNE-PRISM programme addresses this challenge by exploiting off-axis measurements at the Near Detector to reconstruct neutrino fluxes in a largely model-independent way. In this work, we implement and validate a DUNE-PRISM flux-matching framework in which linear combinations of off-axis $\nu_\mu$ fluxes are optimised to reproduce target $\nu_e$ spectra,
\begin{equation}
\Phi_{\nu_e}(E) \simeq \sum_j c_j \, \Phi_{\nu_\mu,j}(E).
\end{equation}
The coefficients $c_j$ are determined through a combined optimisation of interpolation quality and total uncertainty, with Tikhonov regularisation applied to stabilise the solutions. The resulting coefficients are propagated to Monte Carlo event rates to extract estimators of the cross-section ratio $\sigma_{\nu_\mu}/\sigma_{\nu_e}$ and the corresponding neutrino--antineutrino double ratio. Detector effects are included via forward folding to reconstructed energy. The results demonstrate that DUNE-PRISM provides a robust and quantitatively controlled method for reducing flux and cross-section systematics, enhancing DUNE's sensitivity to CP violation.
| Field of Research/Work | Particles and Fields |
|---|
