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arXiv · 2511.03964

The role of final-state interaction modeling in neutrino energy reconstruction and oscillation measurements

Yinrui Liu·Laura Munteanu·Stephen Dolan
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Abstract

We present a quantitative demonstration that, without additional theoretical and experimental efforts, realistic variations in final-state-interaction (FSI) modeling may alter reconstructed neutrino-energy spectra at next-generation long-baseline experiments by amounts comparable to, or larger than, variations induced by oscillation-parameter shifts at their projected precision. Using the DUNE flux and baseline as a case study, we show that these FSI-driven distortions can mimic the effects of changes in the oscillation parameters $\Delta m^2_{32}$ or $\delta_{\rm CP}$, producing a potential degeneracy. Our analysis thereby underscores the urgent need for an improved characterisation of FSI to enable robust constraints from near detectors through the development of theory-driven uncertainty parameterisations benchmarked with dedicated new measurements.

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Yinrui Liu, Laura Munteanu, Stephen Dolan. 2025-11-06. The role of final-state interaction modeling in neutrino energy reconstruction and oscillation measurements. https://doi.org/10.1103/5ckv-2hpk

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