Abstract
The W mass is a crucial parameter in the Standard Model (SM) of particle physics, providing constraints on the mass of the Higgs boson as well as on new physics models via quantum loop corrections. On the other hand, any deviation of the triple gauge boson couplings (TGC) from their values predicted by the SM would be also an indication for new physics. We present recent measurements on W boson mass and searches for anomalous TGC (aTGC) in Wγ, Zγ, WW, WZ and ZZ at Fermilab Tevatron both by CDF and DO Collaborations. The CDF Collaboration has measured the W boson mass using data corresponding to 2.2 fb−1 of integrated luminosity. The measurement, performed using electron and muon decays of W boson, yields a mass of MW = 80387 ± 19 MeV. The DO Collaboration has measured MW = 80367 ± 26 MeV with data corresponding to 4.3 fb−1 of integrated luminosity in the channel W → ev . The combination with an earlier DO result, using independant data sample at 1 fb−1 of integrated luminosity, yields MW = 80375 ± 23 MeV. The limits on anomalous TGCs parameters are consistent with the SM expectations.
Highlights
The W mass is a crucial parameter in the Standard Model (SM) of particle physics, providing constraints on the mass of the Higgs boson as well as on new physics models via quantum loop corrections
We present recent measurements on W boson mass and searches for anomalous triple gauge boson couplings (TGC) in Wγ, Zγ, WW, WZ and ZZ at Fermilab Tevatron both by CDF and DØ Collaborations
A new precision measurement of the W boson mass performed by CDF and DØ Collaborations has improved the precision of the Tevatron average to 16 MeV, which combined with the LEP average slightly reduces the new world average to 15 MeV
Summary
The W mass is a crucial parameter in the Standard Model (SM) of particle physics, providing constraints on the mass of the Higgs boson as well as on new physics models via quantum loop corrections. We present recent measurements on W boson mass and searches for anomalous TGC (aTGC) in Wγ, Zγ, WW, WZ and ZZ at Fermilab Tevatron both by CDF and DØ Collaborations. The CDF Collaboration has measured the W boson mass using data corresponding to 2.2 f b−1 of integrated luminosity. The PDFs used in RESBOS, are CTEQ6.6 [3] They affect the W boson mass measurement through their effects on the kinematics of decay charged leptons. The dominant effect from QED radiation to the W boson mass measurement comes from radiation of photons from the final state charged lepton. These processes are simulated by combining the PHOTOS program [2] with RESBOS. The electromagnetic calorimeter energy scale is set using the peak of the E/p electron distribution from W → eν
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