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Updated: Jul 15, 2026

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Improved Limits on Millicharged Particles Using the ArgoNeuT Experiment at Fermilab.

R Acciarri¹, C Adams², J Asaadi³

¹Fermi National Accelerator Lab, Batavia, Illinois 60510, USA.

Physical Review Letters

|April 18, 2020

Summary

Researchers searched for millicharged particles using the ArgoNeuT detector at Fermilab. One candidate event was observed, providing new constraints on these exotic particles in an unexplored mass and charge range.

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Area of Science:

Particle Physics
Beyond Standard Model Physics

Background:

Millicharged particles are hypothetical particles with electric charges much smaller than the elementary charge.
These particles are predicted by some extensions to the Standard Model of particle physics.
Detecting such particles could reveal new fundamental physics.

Purpose of the Study:

To search for millicharged particles using the ArgoNeuT detector.
To probe a previously unexplored region of parameter space for millicharged particles.

Main Methods:

Utilized the ArgoNeuT liquid argon time projection chamber detector at Fermilab.
Searched for a specific signature of two soft electron recoils (MeV-scale energy depositions) aligned with the beam target.
Analyzed data from an exposure of 1.0×10^{20} protons on target.

Main Results:

Observed one candidate event consistent with expected background.
The search is sensitive to millicharged particles with charges from 10^{-3}e to 10^{-1}e.
The experiment constrains millicharged particle masses between 0.1 and 3 GeV.

Conclusions:

The study provides leading constraints on millicharged particles in a significant unexplored parameter space.
This result contributes to the ongoing search for new physics beyond the Standard Model.