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Precision tests of SM and new physics with the COHERENT Ge-mini and TEXONO data

Tousib Ahmed1,*, Ayan Chattaraj2,†, Anirban Majumdar2,‡, Newton Nath1,§, and Rahul Srivastava2,∥

  • *Contact author: tousibahmed.phy24@itbhu.ac.in
  • †Contact author: ayan23@iiserb.ac.in
  • ‡Contact author: anirban19@iiserb.ac.in
  • §Contact author: nnath.phy@iitbhu.ac.in
  • ∥Contact author: rahul@iiserb.ac.in
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Phys. Rev. D 114, 095001 – Published 2 November, 2026

DOI: https://doi.org/10.1103/yxqm-vzqf

This article was published on 2 November, 2026. Please update your links.

Abstract

A comprehensive numerical analysis of the latest germanium based coherent elastic neutrino nucleus scattering (CEνNS) data from the COHERENT Ge-mini and TEXONO experiments has been conducted to test the Standard Model (SM) and search for new physics. By combining CEνNS and EνES signals with a consistent treatment of detector effects and systematic uncertainties, we obtain a low energy determination of the weak mixing angle from COHERENT Ge-mini, in agreement with the SM prediction. We derive novel constraints on neutrino electromagnetic properties, including the magnetic moment, millicharge, charge radius, and anapole moment, with TEXONO providing particularly competitive bounds. Inclusion of EνES significantly improves the sensitivity to the neutrino millicharge by up to three orders of magnitude. We also investigated light scalar and vector mediators, finding striking complementarity between reactor and stopped pion sources across different mediator mass regimes. Finally, we put bounds on sterile neutral lepton production through transition dipole, scalar, and vector portals, probing masses from the sub-MeV to tens of MeV scale. Our results demonstrate that current germanium based CEνNS experiments provide a powerful low energy laboratory for precision electroweak tests and complementary probes of a broad class of physics beyond the SM.

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Outline

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Phys. Rev. D 114, 095001– Published 2 November, 2026
  • Received 13 August 2026
  • Accepted 8 October 2026
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