This dissertation presents a direct measurement of theW boson mass (MW) and decay width (Γ W) in 1 fb-1 of W → eν collider data at DØ using a novel method to model the hadronic recoil. The mass is extracted from fits to the transverse mass M T, pT(e), and ET distributions. The width is extracted from fits to the tail of the MT distribution. The electron energy measurement is simulated using a parameterized model, and the recoil is modeled using a new technique by which Z recoils are chosen from a data library to match the pT and direction of each generated W boson. We measure the the W boson mass to be MW = 80.4035±0.024(stat)±0.039( syst) from the MT, MW = 80.4165±0.027(stat)±0.038(syst) from the pT(e), and MW = 80.4025±0.023(stat)±0.043( syst) from the ET distributions. Γ W is measured to be ΓW = 2.025 ± 0.038(stat) ± 0.061(syst) GeV.
|Advisor:||Eno, Sarah C.|
|Commitee:||Agashe, Kaustaub, Hadley, Nick, Jawahery, Hassan, McDonough, William|
|School:||University of Maryland, College Park|
|School Location:||United States -- Maryland|
|Source:||DAI-B 70/06, Dissertation Abstracts International|
|Keywords:||D0, Hadronic recoil, Mass, W bosons, Width|
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