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First Constraints on General Neutrino Interactions Based on KATRIN Data.

M Aker1, D Batzler1, A Beglarian2

  • 1Karlsruhe Institute of Technology (KIT), Institute for Astroparticle Physics (IAP), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.

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The KATRIN experiment precisely measured the tritium beta-decay spectrum to search for general neutrino interactions (GNIs). This study provides the first constraints on effective GNI parameters, exploring new physics beyond the Standard Model.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Nuclear Physics

Background:

  • The KATRIN experiment conducts high-precision measurements of the tritium beta-decay spectrum.
  • General Neutrino Interactions (GNIs) are theoretical extensions to the Standard Model involving neutrinos.
  • Searching for GNIs offers a pathway to discover new physics phenomena.

Purpose of the Study:

  • To formulate an effective description of GNIs' impact on the tritium beta spectrum.
  • To derive the first constraints on effective GNI parameters using KATRIN data.
  • To explore KATRIN's potential for discovering specific new physics scenarios.

Main Methods:

  • Incorporating all theoretically allowed dimension-6 GNI terms into a low-energy effective field theory.
  • Analyzing the tritium beta spectrum measured by the KATRIN experiment.
  • Developing an effective description of GNI effects on the beta spectrum.

Main Results:

  • The study derived the first constraints on effective GNI parameters.
  • Analysis was based on 4x10^6 electrons collected during KATRIN's 2019 campaign.
  • Constraints were investigated for specific interactions, including those involving right-handed W bosons, charged Higgs bosons, and leptoquarks.

Conclusions:

  • The KATRIN experiment's precision measurements are valuable for searching for general neutrino interactions.
  • The derived constraints advance the search for new physics beyond the Standard Model.
  • KATRIN demonstrates potential for probing specific new physics models.