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XENONnT pp-Dominated Solar Neutrinos Constrain the ν1 Pseudo-Dirac Splitting

  • Gio Leone
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Abstract

XENONnT has measured a low-energy solar-neutrino signal dominated by pp neutrinos. At these energies, an ultra-small pseudo-Dirac mass-squared splitting induces detectable active-sterile oscillations over the Sun--Earth baseline. We study pseudo-Dirac oscillations of the first mass eigenstate, compute the resulting modification of the pp+7Be electron-recoil spectrum, and construct a likelihood from the published XENONnT energy spectra. We find that the XENONnT data exclude 5.9×10−13 eV2≲ δm12 ≤ 10−11 eV2 at the 2σ level, extending current solar-neutrino sensitivity to smaller mass splittings and approaching a regime previously discussed for future pp-sensitive detectors.

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Cite

BibTeXRIS
BibTeX
@misc{leone2026xenonnt,
  title = {{XENONnT $pp$-Dominated Solar Neutrinos Constrain the $ν_1$ Pseudo-Dirac Splitting}},
  author = {Gio Leone},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2609.38233},
  eprint = {2609.38233},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.38233},
}
RIS
TY  - UNPB
TI  - XENONnT pp-Dominated Solar Neutrinos Constrain the ν_1 Pseudo-Dirac Splitting
AU  - Gio Leone
PY  - 2026
DA  - 2026/10/01
PB  - arXiv
DO  - 10.48550/arxiv.2609.38233
UR  - https://arxiv.org/abs/2609.38233
AB  - XENONnT has measured a low-energy solar-neutrino signal dominated by pp neutrinos. At these energies, an ultra-small pseudo-Dirac mass-squared splitting induces detectable active-sterile oscillations over the Sun--Earth baseline. We study pseudo-Dirac oscillations of the first mass eigenstate, compute the resulting modification of the pp+^7Be electron-recoil spectrum, and construct a likelihood from the published XENONnT energy spectra. We find that the XENONnT data exclude 5.9×10^−13 eV^2≲ δm_1^2 ≤ 10^−11 eV^2 at the 2σ level, extending current solar-neutrino sensitivity to smaller mass splittings and approaching a regime previously discussed for future pp-sensitive detectors.
ER  -