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The CMS collaboration published the most precise measurement of the W Boson mass at LHC so far.
It is in in line with the prediction from the Standard Model of particle physics.
The result is the most precise measurement of the W mass made so far at the LHC, and is in line with the prediction from the Standard Model of particle physics and with all previous measurements, except the measurement from the CDF experiment at the former proton–antiproton Tevatron collider at Fermilab.
In the Standard Model, the W mass is related closely to the strength of the interaction unifying the electromagnetic and weak forces and to the masses of the Higgs boson and the top quark, which constrain its value to 80353 million electronvolts (MeV) within an uncertainty of 6 MeV.
Measuring the W boson mass with high precision therefore makes it possible to test whether or not these properties all align in a way that is consistent with the Standard Model. If they don’t, the cause could be new physics phenomena such as new particles or interactions.
