A group reworking old Tevatron collider measurements of the W boson mass announced a result in April of 2022 that was anomalously high. It was so high that it is basically inconsistent with all other measurements of it (including previous Tevatron measurements) and with a global Standard Model fit.
Now, a collaboration between Tevatron scientists and Large Hadron Collider (LHC) scientists has published a paper that as obliquely as possible, so as to save face for the Tevatron scientists, explains why their previous announcement was too high (which everyone except desperate theorists have basically known since the outset, even if many of them didn't say so out loud), so that the embarrassing debacle of the initial results announcement can be salvaged to provide something of value to science.
The body text of the conference paper, however, suggests that the first step will only reduce the Tevatron W boson mass measurement by about 10 MeV which is still too little, although it helps easy the tension and there is apparently a second installment of adjustments still to come.
We present the current status of the W-boson mass averaging project, an ongoing effort aimed at combining Tevatron and LHC measurements. Methods are presented to accurately evaluate the effect of PDFs and other modelling variations on existing measurements. Based on this approach, the measurements can be corrected to a common modelling reference and to the same PDFs, and subsequently combined accounting for PDF correlations in a quantitative way. We discuss the combination procedure, and the impact of improvements in the theoretical description of W-boson production and decay.
Simone Amoroso (on behalf of the Tevatron/LHC W-mass combination Working Group), "Status of the W-boson mass averaging project" arXiv:2211.12365 (November 22, 2022) (Contribution to the proceedings of the 41st International Conference on High Energy Physics (ICHEP2022), 6-13 July 2022, Bologna, Italy).