Measurement of the W± + b$$\bar{b}$$ cross-section in 695-pb-1 of p$$\bar{p}$$ collisions at CDF II.
- Univ. of Michigan, Ann Arbor, MI (United States)
W± + b$$\bar{b}$$ events contain the associated production of a W± boson, a pair of bottom quarks (b$$\bar{b}$$), and any number of additional partons. This process is of much importance at hadron collider experiments due to its role as a background source in searches for Standard Model Higgs boson and single top-quark production. In this thesis the results are presented for a measurement of the b-jet cross-section in W± + b$$\bar{b}$$ events containing 1 or 2 jets in 695 pb-1 of √s =1.96 TeV p$$\bar{p}$$ collisions at the CDF experiment. This is the first measurement of the cross-section of W± b$$\bar{b}$$ performed in any experiment. The cross-section is defined to be proportional to the number of b-jets from W± b$$\bar{b}$$ events with one or two jets, and a leptonically decaying W± with decay products passing kinematics cuts (pT(ℓ±) ≥ 20.0 GeV, |η(ℓ±)| ≤ 1.1, pT(v) ≥ 25.0 GeV). The invariant mass distribution of jets identified as containing a long-lived hadron is fit with components for bottom, charm, and light-flavor to find the fraction due to true b-decays. Background b-jet sources are subtracted to isolate the contribution of W± b$$\bar{b}$$ to the data. The cross-section is measured to be 0.90 ± 0.20(stat.) ± 0.26(syst.)pb, which compares well with the leading order theoretical prediction of 0.74 ± 0.18 pb.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 923523
- Report Number(s):
- FERMILAB-THESIS-2006-59; TRN: US0801858
- Country of Publication:
- United States
- Language:
- English
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