Disentangling Charged-Current Scalar NSI from the Solar Sector at JUNO

Adriano Cherchiglia; Pietro Chimenti; Christiane Frigerio Martins; Guilherme A. Nogueira; Pedro Pasquini; Orlando L. G. Peres

arXiv · 2608.21521

Disentangling Charged-Current Scalar NSI from the Solar Sector at JUNO

Adriano Cherchiglia·Pietro Chimenti·Christiane Frigerio Martins·Guilherme A. Nogueira·Pedro Pasquini·Orlando L. G. Peres

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Abstract

We constrain charged-current scalar non-standard interaction with reactor antineutrinos within a quantum field theory framework of neutrino oscillations. We derive an analytical expression up to $\mathcal{O}(\varepsilon^{4})$ for the electron antineutrino survival probability including scalar NSI contributions, and show that these effects induce spectral distortions that admit a large mixing angle solution for $\theta_{12}$. Using the 59.1-day and preliminary 207.2-day JUNO datasets, we obtain the first neutrino-oscillation determination of NSI parameters individually, rather than in a flavor-summed combination, from reactor experiments. Assuming one year of data taken, we show that the only solar sector analysis breaks the degeneracy with the solar mixing angle at $3\sigma$ of C.L.

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Adriano Cherchiglia, Pietro Chimenti, Christiane Frigerio Martins, Guilherme A. Nogueira, Pedro Pasquini, Orlando L. G. Peres. 2026-08-21. Disentangling Charged-Current Scalar NSI from the Solar Sector at JUNO. https://arxiv.org/abs/2608.21521

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