The new measurement of the W boson mass falls into the precision category.
The CDF collaboration measured the W boson mass to be 80387 +/- 19 MeV/c2.
"Tevatron experiments discovered the top quark, made precision measurements of the W boson mass, observed B_s mixing and set many limits on potential new physics theories."
The existence of the world we live in depends on the W boson mass being heavy rather than massless as the Standard Model predicts.
The W boson is a carrier of the electroweak nuclear force that is responsible for such fundamental process as the production of energy in the sun.
In the top tagging algorithm a [chi square] based method is used to find the correct combination of the jets with their invariant mass in agreement with the W boson
and the top quark masses.
Atlas has already identified what appear to be lower-mass W bosons
from their "decay products" in collisions at the LHC.
According to the standard model, a top quark should always decay into a W boson
and a bottom quark, but it is also possible that a lighter quark may come out of the process.
Of course in this case, a large number of particles are produced due to the decay of the top quark to W boson and its subsequent decay to leptons or light jets.
Hashemi, "Possibility of observing an MSSM charged Higgs boson in association with a W boson at the LHC," Physical Review D, vol.
Search for heavy neutrinos and W bosons
with right-handed couplings in proton-proton collisions at [square root of s] = 8 TeV.