Constraining and Resolving Lorentz-Violating New Physics at ESSnuSB Using Complementarity with DUNE

TL;DR

This paper investigates how combining data from ESSnuSB and DUNE can improve sensitivity to Lorentz-violating effects in neutrino oscillations, resolving degeneracies and strengthening constraints on new physics.

Contribution

It demonstrates that a joint analysis of ESSnuSB and DUNE can effectively resolve degeneracies caused by Lorentz violation, enhancing the detection sensitivity for Planck-scale physics.

Findings

LIV effects can mimic standard oscillation parameter variations.

Combining ESSnuSB baselines improves sensitivity but doesn't fully resolve degeneracies.

Joint ESSnuSB+DUNE analysis can successfully break degeneracies and constrain LIV parameters.

Abstract

We examine the sensitivity of the ESSnuSB and DUNE long-baseline neutrino experiments to isotropic, CPT-violating Lorentz Invariance Violation (LIV). Using detailed simulations for the 360 km and 540 km ESSnuSB baselines and the 1300 km DUNE setup, we assess how LIV parameters influence oscillation probabilities, event spectra, and degeneracies among oscillation parameters. We find that LIV-induced modifications can closely mimic variations in $\theta_{23}$ and $\delta_{\rm CP}$, potentially leading to incorrect determination of the atmospheric mixing angle octant and the leptonic CP phase if LIV effects are not accounted for. Although combining the two ESSnuSB baselines improves overall sensitivity, it does not fully remove these degeneracies. In contrast, a joint ESSnuSB+DUNE analysis benefiting from the synergy between second-maximum sensitivity at ESSnuSB and first-maximum, matter-enhanced sensitivity at DUNE can successfully resolve all these degeneracies and can yield significantly stronger constraints on all the LIV parameters. The results presented here highlights the essential role of multi-baseline, multi-energy experimental strategies to probe Planck-suppressed Lorentz-violating new physics.