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δCP-free constraints on NSI parameters ϵeμ and ϵeτ using high-purity νμ CC events at IceCube DeepCore

J Krishnamoorthi1,2,*, Anil Kumar1,†, and Sanjib Kumar Agarwalla1,3,‡

  • *Contact author: krishnamoorthi.j@iopb.res.in
  • †Contact author: anil.k@iopb.res.in
  • ‡Contact author: sanjib@iopb.res.in
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Phys. Rev. D 114, 015007 – Published 6 July, 2026

DOI: https://doi.org/10.1103/jv6k-crql

Abstract

Atmospheric neutrinos provide a unique avenue to probe theories beyond the Standard Model (BSM) over a wide range of energies and path lengths. The theory of nonstandard interactions (NSI) of neutrinos is one of the important BSM scenarios, which can modify flavor oscillations of atmospheric neutrinos traveling through the Earth. In this work, we use a high-purity νμ charged-current (CC) sample of atmospheric neutrinos from IceCube DeepCore with a livetime of 7.5 years to search for the NSI parameters ϵeμ, ϵeτ, and ϵee−ϵμμ. The νμ CC events mainly come from the νμ survival channel having no significant dependence on δCP. Therefore, the constraints on ϵeμ and ϵeτ obtained using this νμ CC sample are expected to be free from the δCP-degeneracy. The data sample is found to be in agreement with the standard neutrino interactions. Therefore, we place bounds on these NSI parameters that are consistent with and comparable to existing experimental constraints. These δCP-free constraints from IceCube DeepCore are complementary to those from the long-baseline neutrino oscillation experiments, where the appearance channel depends on δCP.

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Phys. Rev. D 114, 015007– Published 6 July, 2026
  • Received 8 May 2026
  • Accepted 11 June 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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