The DZero collaboration has reported the most precise measurement of the W-boson mass. This should have wide-ranging ramifications, including putting more constraints on the Higgs mass.

The CDF collaboration recently measured the W boson mass to be 80387 +/- 19 MeV/c2. The DZero collaboration measured the particle’s mass to be 80375 +-23 MeV/c2. The two new measurements, along with the addition of previous data from the earliest operation of the Tevatron, combine to produce a measurement of 80387 +- 17 MeV/c2, which has a precision of 0.02 percent.

I'm sure there will be more to come out of the retired "old lady".

Zz.

## 2 comments:

Dear ZZ, the CDF measurement, while using 2 times less statistics, is nevertheless more accurate than the D0 one.

More accurate is true for CDF, but not 2 times less statistics. D0 uses only the electron channel, while CDF uses both the muon and electron channels which doubles (CDF's) statistics. The higher precision from CDF is what benefited from its better tracking system for lepton momentum measurement.

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