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After a decade of painstaking data collection and analysis, an international team of physicists — including researchers from Rutgers University — has overturned a long-standing theory about one of the universe’s most elusive particles.
Their breakthrough findings, published in Nature, come from the MicroBooNE experiment at the U.S. Department of Energy’s Fermi National Accelerator Laboratory (Fermilab) in Batavia, Illinois. MicroBooNE, short for “Micro Booster Neutrino Experiment,” uses cutting-edge technology to investigate the strange behavior of neutrinos.
By harnessing a highly sensitive liquid-argon detector and studying neutrinos from two independent beams, the scientists were able to rule out — with 95 percent confidence — the existence of a single sterile neutrino, a hypothetical particle long proposed to explain puzzling results from earlier experiments.
Andrew Mastbaum, an associate professor in Rutgers’ Department of Physics and Astronomy and a member of the MicroBooNE leadership team, called the finding a pivotal moment.
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“This result will spark innovative ideas across neutrino research to understand what is really going on,” he said. “We can rule out a great suspect, but that doesn’t quite solve a mystery.”
Neutrinos are nearly massless subatomic particles that pass effortlessly through matter, making them extraordinarily difficult to study. The Standard Model of particle physics predicts three types — electron, muon, and tau — and these particles can transform into one another through a phenomenon called oscillation.
But earlier experiments detected anomalies that didn’t fit the model. To account for the discrepancy, physicists proposed a fourth type: the sterile neutrino, which would interact even less than the known neutrinos, making it almost undetectable.
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MicroBooNE set out to put this idea to the test. After ten years of observations and meticulous analysis, the team found no evidence supporting the sterile neutrino hypothesis — closing the book on one of the most prominent explanations for the unusual neutrino behavior seen in past studies.
Mastbaum played a central role in shaping the experiment’s analysis strategy, serving as co-coordinator for the tools and techniques used to convert raw detector signals into scientific conclusions. He also led earlier efforts to understand systematic uncertainties — potential sources of error such as neutrino–nucleus interactions, neutrino beam composition, and detector performance. “Getting these uncertainties right is critical,” Mastbaum said. “It allows us to make strong, reliable statements about what the data really shows.”
Rutgers doctoral students were also integral to the project. Panagiotis Englezos contributed to data processing and simulations as part of the Data Management Team, while Keng Lin helped validate the neutrino flux from Fermilab’s NuMI beam, ensuring the robustness of the analysis.
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The significance of the result extends far beyond ruling out a single theory. The Standard Model, though powerful, cannot explain dark matter, dark energy, or gravity. Eliminating the sterile neutrino hypothesis helps narrow the search for new physics and directs scientists toward alternative pathways that may unlock deeper truths about the universe.
Rutgers researchers also advanced key techniques for measuring neutrino interactions in liquid argon detectors — innovations that will directly benefit future large-scale projects such as the Deep Underground Neutrino Experiment (DUNE).
“With careful modeling and clever analysis approaches, the MicroBooNE team has squeezed an incredible amount of information out of this detector,” Mastbaum said. “With next-generation experiments like DUNE, we’re already using these advances to pursue even more fundamental questions about the nature of matter and the origins of the universe.”
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