Compatibility and combination of world W-boson mass measurements

The compatibility of W-boson mass measurements performed by the ATLAS, LHCb, CDF, and D0 experiments is studied using a coherent framework with theory uncertainty correlations. The measurements are combined using a number of recent sets of parton distribution functions (PDF), and are further combined with the average value of measurements from the Large Electron–Positron collider. The considered PDF sets generally have a low compatibility with a suite of global rapidity-sensitive Drell–Yan measurements. The most compatible set is CT18 due to its larger uncertainties. A combination of all m_W measurements yields a value of m_W = 80,394.6 ± 11.5 MeV with the CT18 set, but has a probability of compatibility of 0.5 80,369.2 ± 13.3 MeV, which differs by 3.6σ from the CDF value determined using the same PDF set.