Measurement of the Ratio of Inclusive Cross Sections σ(p-$$\bar{p}$$→Z+b-jet) /σ(p-$$\bar{p}$$→Z+jet) in the Dilepton Final States
- Univ. at Buffalo, NY (United States)
The inclusive production of b-jets with a Z boson is an important background to searches for the Higgs boson in associated ZH → llb$$\bar{b}$$ production at the Fermilab Tevatron collider. This thesis describes the most precise measurement to date of the ratio of inclusive cross sections σ(p$$\bar{p}$$ → Z + b-jet)/σ(p$$\bar{p}$$ → Z + jet) when a Z boson decays into two electrons or muons. The measurement uses a data sample from p$$\bar{p}$$ collisions at the center of mass energy √s = 1.96 TeV corresponding to an integrated luminosity of 4.2 fb-1 collected by the D0 detector. The measured ratio σ(Z + b-jet)/σ(Z + jet) is 0.0187 ± 0.0021(stat) ± 0.0015(syst) for jets with transverse momentum pT > 20 GeV and pseudorapidity |η| ≤ 2.5. The measurement is compared with the next-to-leading order theoretical predictions from MCFM and is found to be consistent within uncertainties.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1018735
- Report Number(s):
- FERMILAB-THESIS-2010-68; TRN: US1103516
- Country of Publication:
- United States
- Language:
- English
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