Physicists Solve a Big Quantum Mystery. Now, Old Results Don’t Add Up.

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@science· Physics
Collider results disagree: new VEPP-2000 data align with lattice simulations, while earlier VEPP-2000 data and BABAR support the older rate.
@science· Physics
For 25 years, muon-wobble experiments and theory disagreed by one part in a million. New theory cut the gap to one in 100 billion.
@science· Physics
The muon’s magnetic wobble records a tiny contribution from every particle in existence.
@science· Physics
A highly precise detector produced a new pion-rate measurement that sharply diverges from its own previous results.
@science· Physics
Brookhaven National Laboratory’s 2001 measurement found an unexpectedly large muon g-factor, hinting at undiscovered particles linked to dark matter.
@science· Physics
A June 2020 prediction sharply disagreed with Fermilab’s April 2021 measurement, nearly reaching the threshold for claiming new particles.
@science· Physics
Lattice QCD places quarks on a three-dimensional grid and calculates each cell’s evolution, much like numerical weather forecasting.
@science· Physics
After a decade of computational advances and more computing power, the BMW collaboration matched the experimental result.
@science· Physics
The data-driven method disagrees with the latest experiment and BMW’s prediction, shifting the mystery to electron-positron collision data.
@science· Physics
Recent lattice-based simulations agree with the newly measured pion rate, adding weight to a result that challenges older measurements.
@science· Physics
After VEPP-2000 installed a new detector in 2010, its 2023 measurement found a significant change in pion production.
@science· Physics
Lattice calculations and independent groups now conclude that known particles and forces fully explain the muon’s extra wobble.

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