A bit old now, but I haven't seen it posted in the thread yet: New data suggests that the W Boson is heavier than predicted than the standard model. This measurement is 7 standard deviations beyond what the standard model predicts, the most contradictory experimental result yet. The standard model has held up well in almost all experiments, so this is quite significant.
https://astronomy.com/news/2022/04/trillions-of-collisions-show-the-w-boson-is-more-massive-than-expected#:~:text=The%20W%20boson's%20mass%20came,times%20the%20margin%20of%20error.To avoid any bias creeping into the analysis, nobody could see any results until the full calculation was complete.
When the physics world finally saw the result on April 7, 2022, we were all surprised. Physicists measure elementary particle masses in units of millions of electron volts – shortened to MeV. The W boson’s mass came out to be 80,433 MeV – 70 MeV higher than what the Standard Model predicts it should be. This may seem like a tiny excess, but the measurement is accurate to within 9 MeV. This is a deviation of nearly eight times the margin of error. When my colleagues and I saw the result, our reaction was a resounding “wow!”
