CP-Violating Neutrino Nonstandard Interactions in Long-Baseline-Accelerator Data

Peter B. Denton (High Energy Theory Group, Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA) ; Julia Gehrlein (High Energy Theory Group, Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA) ; Rebekah Pestes (High Energy Theory Group, Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA; Center for Neutrino Physics, Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA)

Neutrino oscillations in matter provide a unique probe of new physics. Leveraging the advent of neutrino appearance data from NOvA and T2K in recent years, we investigate the presence of CP-violating neutrino nonstandard interactions in the oscillation data. We first show how to very simply approximate the expected NSI parameters to resolve differences between two long-baseline appearance experiments analytically. Then, by combining recent NOvA and T2K data, we find a tantalizing hint of CP-violating NSI preferring a new complex phase that is close to maximal: ϕeμ or ϕeτ3π/2 with |εeμ| or |εeτ|0.2. We then compare the results from long-baseline data to constraints from IceCube and COHERENT.

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      "title": "<math><mi>C</mi><mi>P</mi></math>-Violating Neutrino Nonstandard Interactions in Long-Baseline-Accelerator Data"
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      "value": "Neutrino oscillations in matter provide a unique probe of new physics. Leveraging the advent of neutrino appearance data from NOvA and T2K in recent years, we investigate the presence of <math><mi>C</mi><mi>P</mi></math>-violating neutrino nonstandard interactions in the oscillation data. We first show how to very simply approximate the expected NSI parameters to resolve differences between two long-baseline appearance experiments analytically. Then, by combining recent NOvA and T2K data, we find a tantalizing hint of <math><mi>C</mi><mi>P</mi></math>-violating NSI preferring a new complex phase that is close to maximal: <math><msub><mi>\u03d5</mi><mrow><mi>e</mi><mi>\u03bc</mi></mrow></msub></math> or <math><msub><mi>\u03d5</mi><mrow><mi>e</mi><mi>\u03c4</mi></mrow></msub><mo>\u2248</mo><mn>3</mn><mi>\u03c0</mi><mo>/</mo><mn>2</mn></math> with <math><mo>|</mo><msub><mi>\u03b5</mi><mrow><mi>e</mi><mi>\u03bc</mi></mrow></msub><mo>|</mo></math> or <math><mo>|</mo><msub><mi>\u03b5</mi><mrow><mi>e</mi><mi>\u03c4</mi></mrow></msub><mo>|</mo><mo>\u223c</mo><mn>0.2</mn></math>. We then compare the results from long-baseline data to constraints from IceCube and COHERENT."
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Published on:
04 February 2021
Publisher:
APS
Published in:
Physical Review Letters , Volume 126 (2021)
Issue 5
DOI:
https://doi.org/10.1103/PhysRevLett.126.051801
arXiv:
2008.01110
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

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