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Physicists Set New Neutrino Mass Limit at 0.45 eV

4/12/2025

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Summary

Story summary

Physicists from the KATRIN experiment have made a groundbreaking discovery, setting the upper mass limit of neutrinos at 0.45 electron volts (eV). This finding defies the long-held belief that neutrinos are massless. By meticulously analyzing data from 36 million electrons over 259 days, they have doubled the precision of this measurement, deepening our grasp of the elusive particles that shape our universe.

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Story summary

Physicists from the KATRIN experiment have made a groundbreaking discovery, setting the upper mass limit of neutrinos at 0.45 electron volts (eV). This finding defies the long-held belief that neutrinos are massless. By meticulously analyzing data from 36 million electrons over 259 days, they have doubled the precision of this measurement, deepening our grasp of the elusive particles that shape our universe.